diff --git a/src/tags_int.cpp b/src/tags_int.cpp
index 797748e5..6b2a1d04 100644
--- a/src/tags_int.cpp
+++ b/src/tags_int.cpp
@@ -2577,26 +2577,69 @@ std::ostream& printExifUnit(std::ostream& os, const Value& value, const ExifData
 
 std::ostream& printLensSpecification(std::ostream& os, const Value& value, const ExifData*) {
   std::ios::fmtflags f(os.flags());
-  if (value.count() != 4 || value.toRational(0).second == 0 || value.toRational(1).second == 0) {
+  // check type and count of values
+  if (value.typeId() != unsignedRational || value.count() != 4 ||
+      // divisor may be zero only if dividend is not zero
+      value.toRational(0).first != 0 && value.toRational(0).second == 0 ||
+      value.toRational(1).first != 0 && value.toRational(1).second == 0 ||
+      value.toRational(2).first != 0 && value.toRational(2).second == 0 ||
+      value.toRational(3).first != 0 && value.toRational(3).second == 0) {
     os << "(" << value << ")";
     return os;
   }
-  const int64_t len1 = value.toInt64(0);
-  const int64_t len2 = value.toInt64(1);
+  // values numerically are ok, so they can be converted
+  // here first and second can be zero, so initialise float with 0.0
+  float focalLength1 = 0.0;
+  if (value.toRational(0).first != 0)
+    focalLength1 = value.toFloat(0);
+  float focalLength2 = 0.0;
+  if (value.toRational(1).first != 0)
+    focalLength2 = value.toFloat(1);
+  float fNumber1 = 0.0;
+  if (value.toRational(2).first != 0)
+    fNumber1 = value.toFloat(2);
+  float fNumber2 = 0.0;
+  if (value.toRational(3).first != 0)
+    fNumber2 = value.toFloat(3);
 
-  auto [r1, s1] = value.toRational(2);
-  auto [r2, s2] = value.toRational(3);
-  os << len1;
-  if (len2 != len1) {
-    os << "-" << len2;
+  // first value must not be bigger than second
+  if (focalLength1 > focalLength2 && focalLength2 > 0.0 || fNumber1 > fNumber2 && fNumber2 > 0.0) {
+    os << "(" << value << ")";
+    return os;
   }
-  os << "mm ";
+
+  // no lens specification available
+  if (focalLength1 == 0.0 && focalLength2 == 0.0 && fNumber1 == 0.0 && fNumber2 == 0.0) {
+    os << "n/a";
+    return os;
+  }
+
+  // lens specification available - at least parts
+  if (focalLength1 == 0.0)
+    os << "n/a";
+  else
+    os << std::setprecision(5) << focalLength1;
+  if (focalLength1 != focalLength2) {
+    if (focalLength2 == 0.0)
+      os << "-n/a ";
+    else
+      os << "-" << std::setprecision(5) << focalLength2;
+  }
+  os << "mm";
   std::ostringstream oss;
   oss.copyfmt(os);
-  if (s1 > 0.0 && s2 > 0.0) {
-    os << "F" << std::setprecision(2) << static_cast<float>(r1) / s1;
-    if (r2 != r1) {
-      os << "-" << std::setprecision(2) << static_cast<float>(r2) / s2;
+
+  if (fNumber1 > 0.0 || fNumber2 > 0.0) {
+    os << " F";
+    if (fNumber1 == 0.0)
+      os << " n/a";
+    else
+      os << std::setprecision(2) << fNumber1;
+    if (fNumber1 != fNumber2) {
+      if (fNumber2 == 0.0)
+        os << "-n/a";
+      else
+        os << "-" << std::setprecision(2) << fNumber2;
     }
   }
   os.copyfmt(oss);
diff --git a/test/data/test_reference_files/2021-02-13-1929.heic.out b/test/data/test_reference_files/2021-02-13-1929.heic.out
index 4b99a793..59547760 100644
--- a/test/data/test_reference_files/2021-02-13-1929.heic.out
+++ b/test/data/test_reference_files/2021-02-13-1929.heic.out
@@ -41,7 +41,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.FocalLengthIn35mmFilm             Short       1  26  26.0 mm
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
-Exif.Photo.LensSpecification                 Rational    4  17/4 17/4 9/5 9/5  4mm F1.8
+Exif.Photo.LensSpecification                 Rational    4  17/4 17/4 9/5 9/5  4.25mm F1.8
 Exif.Photo.LensMake                          Ascii       6  Apple  Apple
 Exif.Photo.LensModel                         Ascii      35  iPhone XR back camera 4.25mm f/1.8  iPhone XR back camera 4.25mm f/1.8
 Exif.Photo.CompositeImage                    Short       1  2  GeneralComposite
diff --git a/test/data/test_reference_files/20220610_MG_7237.exv.out b/test/data/test_reference_files/20220610_MG_7237.exv.out
index 840e8530..5351adff 100644
--- a/test/data/test_reference_files/20220610_MG_7237.exv.out
+++ b/test/data/test_reference_files/20220610_MG_7237.exv.out
@@ -200,7 +200,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      14  Peter Wemmert  Peter Wemmert
 Exif.Photo.BodySerialNumber                  Ascii      13  113053000536  113053000536
-Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm
 Exif.Photo.LensModel                         Ascii      21  EF35-80mm f/4-5.6 PZ  EF35-80mm f/4-5.6 PZ
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  25802  25802
diff --git a/test/data/test_reference_files/20220610_MG_7238.exv.out b/test/data/test_reference_files/20220610_MG_7238.exv.out
index 6273802c..8dba21d0 100644
--- a/test/data/test_reference_files/20220610_MG_7238.exv.out
+++ b/test/data/test_reference_files/20220610_MG_7238.exv.out
@@ -200,7 +200,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      14  Peter Wemmert  Peter Wemmert
 Exif.Photo.BodySerialNumber                  Ascii      13  113053000536  113053000536
-Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm
 Exif.Photo.LensModel                         Ascii      18  EF35-80mm f/4-5.6  EF35-80mm f/4-5.6
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  25798  25798
diff --git a/test/data/test_reference_files/20220610_MG_7239.exv.out b/test/data/test_reference_files/20220610_MG_7239.exv.out
index cd4f22da..8d8a23ac 100644
--- a/test/data/test_reference_files/20220610_MG_7239.exv.out
+++ b/test/data/test_reference_files/20220610_MG_7239.exv.out
@@ -200,7 +200,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      14  Peter Wemmert  Peter Wemmert
 Exif.Photo.BodySerialNumber                  Ascii      13  113053000536  113053000536
-Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm
 Exif.Photo.LensModel                         Ascii      21  EF35-80mm f/4-5.6 II  EF35-80mm f/4-5.6 II
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  25802  25802
diff --git a/test/data/test_reference_files/20220610_MG_7240.exv.out b/test/data/test_reference_files/20220610_MG_7240.exv.out
index 006475da..004bc139 100644
--- a/test/data/test_reference_files/20220610_MG_7240.exv.out
+++ b/test/data/test_reference_files/20220610_MG_7240.exv.out
@@ -200,7 +200,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      14  Peter Wemmert  Peter Wemmert
 Exif.Photo.BodySerialNumber                  Ascii      13  113053000536  113053000536
-Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm
 Exif.Photo.LensModel                         Ascii      22  EF35-80mm f/4-5.6 III  EF35-80mm f/4-5.6 III
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  25802  25802
diff --git a/test/data/test_reference_files/20220610_MG_7241.exv.out b/test/data/test_reference_files/20220610_MG_7241.exv.out
index 93cb7942..ac77dd28 100644
--- a/test/data/test_reference_files/20220610_MG_7241.exv.out
+++ b/test/data/test_reference_files/20220610_MG_7241.exv.out
@@ -200,7 +200,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      14  Peter Wemmert  Peter Wemmert
 Exif.Photo.BodySerialNumber                  Ascii      13  113053000536  113053000536
-Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 80/1 0/1 0/1  35-80mm
 Exif.Photo.LensModel                         Ascii      22  EF35-80mm f/4-5.6 USM  EF35-80mm f/4-5.6 USM
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  25802  25802
diff --git a/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_1xx.exv.out b/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_1xx.exv.out
index 914ec075..9f0d0185 100644
--- a/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_1xx.exv.out
+++ b/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_1xx.exv.out
@@ -197,7 +197,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      27  Leonardo Brondani Schenkel  Leonardo Brondani Schenkel
-Exif.Photo.LensSpecification                 Rational    4  18/1 35/1 0/1 0/1  18-35mm F0
+Exif.Photo.LensSpecification                 Rational    4  18/1 35/1 0/1 0/1  18-35mm
 Exif.Photo.LensModel                         Ascii       8  18-35mm  18-35mm
 Exif.Image.GPSTag                            Long        1  9406  9406
 Exif.GPSInfo.GPSVersionID                    Byte        4  2 3 0 0  2.3.0.0
diff --git a/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_2xx.exv.out b/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_2xx.exv.out
index 04407f8f..65aef6e5 100644
--- a/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_2xx.exv.out
+++ b/test/data/test_reference_files/Canon_Sigma_18_35_F18_DC_HSM_firmware_2xx.exv.out
@@ -197,7 +197,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      27  Leonardo Brondani Schenkel  Leonardo Brondani Schenkel
-Exif.Photo.LensSpecification                 Rational    4  18/1 35/1 0/1 0/1  18-35mm F0
+Exif.Photo.LensSpecification                 Rational    4  18/1 35/1 0/1 0/1  18-35mm
 Exif.Photo.LensModel                         Ascii      30  18-35mm F1.8 DC HSM | Art 013  18-35mm F1.8 DC HSM | Art 013
 Exif.Image.GPSTag                            Long        1  9428  9428
 Exif.GPSInfo.GPSVersionID                    Byte        4  2 3 0 0  2.3.0.0
diff --git a/test/data/test_reference_files/IMG_1361.dng.out b/test/data/test_reference_files/IMG_1361.dng.out
index 1176eca4..87e0fdc3 100644
--- a/test/data/test_reference_files/IMG_1361.dng.out
+++ b/test/data/test_reference_files/IMG_1361.dng.out
@@ -139,7 +139,7 @@ Exif.Photo.SceneType                         Undefined   1  1  Directly photogra
 Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.FocalLengthIn35mmFilm             Short       1  26  26.0 mm
-Exif.Photo.LensSpecification                 Rational    4  807365/524263 6/1 8/5 12/5  1-6mm F1.6-2.4
+Exif.Photo.LensSpecification                 Rational    4  807365/524263 6/1 8/5 12/5  1.54-6mm F1.6-2.4
 Exif.Photo.LensMake                          Ascii       6  Apple  Apple
 Exif.Photo.LensModel                         Ascii      45  iPhone 12 Pro back triple camera 4.2mm f/1.6  iPhone 12 Pro back triple camera 4.2mm f/1.6
 Exif.Image.GPSTag                            Long        1  4630  4630
diff --git a/test/data/test_reference_files/IMG_3578.heic.out b/test/data/test_reference_files/IMG_3578.heic.out
index 123d6de6..9ca055db 100644
--- a/test/data/test_reference_files/IMG_3578.heic.out
+++ b/test/data/test_reference_files/IMG_3578.heic.out
@@ -40,7 +40,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.FocalLengthIn35mmFilm             Short       1  26  26.0 mm
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
-Exif.Photo.LensSpecification                 Rational    4  17/4 17/4 9/5 9/5  4mm F1.8
+Exif.Photo.LensSpecification                 Rational    4  17/4 17/4 9/5 9/5  4.25mm F1.8
 Exif.Photo.LensMake                          Ascii       6  Apple  Apple
 Exif.Photo.LensModel                         Ascii      35  iPhone XR back camera 4.25mm f/1.8  iPhone XR back camera 4.25mm f/1.8
 Exif.Photo.CompositeImage                    Short       1  2  GeneralComposite
diff --git a/test/data/test_reference_files/Sigma_14-24mm_F2.8_DG_HSM_A_for_EOS.exv.out b/test/data/test_reference_files/Sigma_14-24mm_F2.8_DG_HSM_A_for_EOS.exv.out
index 5b5eb40d..f3f7460a 100644
--- a/test/data/test_reference_files/Sigma_14-24mm_F2.8_DG_HSM_A_for_EOS.exv.out
+++ b/test/data/test_reference_files/Sigma_14-24mm_F2.8_DG_HSM_A_for_EOS.exv.out
@@ -216,7 +216,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
-Exif.Photo.LensSpecification                 Rational    4  14/1 24/1 0/1 0/1  14-24mm F0
+Exif.Photo.LensSpecification                 Rational    4  14/1 24/1 0/1 0/1  14-24mm
 Exif.Photo.LensModel                         Ascii      30  14-24mm F2.8 DG HSM | Art 018  14-24mm F2.8 DG HSM | Art 018
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  42390  42390
diff --git a/test/data/test_reference_files/Sigma_28mm_F1.4_DG_HSM_A_for_EOS.exv.out b/test/data/test_reference_files/Sigma_28mm_F1.4_DG_HSM_A_for_EOS.exv.out
index a1b95a12..a547fb86 100644
--- a/test/data/test_reference_files/Sigma_28mm_F1.4_DG_HSM_A_for_EOS.exv.out
+++ b/test/data/test_reference_files/Sigma_28mm_F1.4_DG_HSM_A_for_EOS.exv.out
@@ -217,7 +217,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
-Exif.Photo.LensSpecification                 Rational    4  28/1 28/1 0/1 0/1  28mm F0
+Exif.Photo.LensSpecification                 Rational    4  28/1 28/1 0/1 0/1  28mm
 Exif.Photo.LensModel                         Ascii      27  28mm F1.4 DG HSM | Art 019  28mm F1.4 DG HSM | Art 019
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  42400  42400
diff --git a/test/data/test_reference_files/Sigma_35mm_F1.4_DG_HSM_A_for_EOS.exv.out b/test/data/test_reference_files/Sigma_35mm_F1.4_DG_HSM_A_for_EOS.exv.out
index 4d800ef6..edc92f74 100644
--- a/test/data/test_reference_files/Sigma_35mm_F1.4_DG_HSM_A_for_EOS.exv.out
+++ b/test/data/test_reference_files/Sigma_35mm_F1.4_DG_HSM_A_for_EOS.exv.out
@@ -218,7 +218,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
-Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm
 Exif.Photo.LensModel                         Ascii      27  35mm F1.4 DG HSM | Art 012  35mm F1.4 DG HSM | Art 012
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  43020  43020
diff --git a/test/data/test_reference_files/Sigma_40mm_F1.4_DG_HSM_A_for_EOS.exv.out b/test/data/test_reference_files/Sigma_40mm_F1.4_DG_HSM_A_for_EOS.exv.out
index 5b9a8473..ac6f9ba1 100644
--- a/test/data/test_reference_files/Sigma_40mm_F1.4_DG_HSM_A_for_EOS.exv.out
+++ b/test/data/test_reference_files/Sigma_40mm_F1.4_DG_HSM_A_for_EOS.exv.out
@@ -216,7 +216,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
-Exif.Photo.LensSpecification                 Rational    4  40/1 40/1 0/1 0/1  40mm F0
+Exif.Photo.LensSpecification                 Rational    4  40/1 40/1 0/1 0/1  40mm
 Exif.Photo.LensModel                         Ascii      27  40mm F1.4 DG HSM | Art 018  40mm F1.4 DG HSM | Art 018
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  42388  42388
diff --git a/test/data/test_reference_files/Sigma_50mm_F1.4_DG_HSM_A_for_EOS.exv.out b/test/data/test_reference_files/Sigma_50mm_F1.4_DG_HSM_A_for_EOS.exv.out
index 9a96ccab..c1868f33 100644
--- a/test/data/test_reference_files/Sigma_50mm_F1.4_DG_HSM_A_for_EOS.exv.out
+++ b/test/data/test_reference_files/Sigma_50mm_F1.4_DG_HSM_A_for_EOS.exv.out
@@ -218,7 +218,7 @@ Exif.Photo.ExposureMode                      Short       1  0  Auto
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
-Exif.Photo.LensSpecification                 Rational    4  50/1 50/1 0/1 0/1  50mm F0
+Exif.Photo.LensSpecification                 Rational    4  50/1 50/1 0/1 0/1  50mm
 Exif.Photo.LensModel                         Ascii      27  50mm F1.4 DG HSM | Art 014  50mm F1.4 DG HSM | Art 014
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  43020  43020
diff --git a/test/data/test_reference_files/Sigma_60-600mm_F4.5-6.3_DG_OS_HSM_S_for_EOS.exv.out b/test/data/test_reference_files/Sigma_60-600mm_F4.5-6.3_DG_OS_HSM_S_for_EOS.exv.out
index 02940442..df2d2a0a 100644
--- a/test/data/test_reference_files/Sigma_60-600mm_F4.5-6.3_DG_OS_HSM_S_for_EOS.exv.out
+++ b/test/data/test_reference_files/Sigma_60-600mm_F4.5-6.3_DG_OS_HSM_S_for_EOS.exv.out
@@ -216,7 +216,7 @@ Exif.Photo.ExposureMode                      Short       1  1  Manual
 Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
-Exif.Photo.LensSpecification                 Rational    4  60/1 600/1 0/1 0/1  60-600mm F0
+Exif.Photo.LensSpecification                 Rational    4  60/1 600/1 0/1 0/1  60-600mm
 Exif.Photo.LensModel                         Ascii      41  60-600mm F4.5-6.3 DG OS HSM | Sports 018  60-600mm F4.5-6.3 DG OS HSM | Sports 018
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  42402  42402
diff --git a/test/data/test_reference_files/TamronSP15-30mmF2.8DiVCUSDA012.exv.out b/test/data/test_reference_files/TamronSP15-30mmF2.8DiVCUSDA012.exv.out
index 8c1195f1..1faf6a97 100644
--- a/test/data/test_reference_files/TamronSP15-30mmF2.8DiVCUSDA012.exv.out
+++ b/test/data/test_reference_files/TamronSP15-30mmF2.8DiVCUSDA012.exv.out
@@ -196,7 +196,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  253020008411  253020008411
-Exif.Photo.LensSpecification                 Rational    4  15/1 30/1 0/1 0/1  15-30mm F0
+Exif.Photo.LensSpecification                 Rational    4  15/1 30/1 0/1 0/1  15-30mm
 Exif.Photo.LensModel                         Ascii      39  TAMRON SP 15-30mm F/2.8 Di VC USD A012  TAMRON SP 15-30mm F/2.8 Di VC USD A012
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  8930  8930
diff --git a/test/data/test_reference_files/TamronSP90mmF2.8DiVCUSDMacroF017.exv.out b/test/data/test_reference_files/TamronSP90mmF2.8DiVCUSDMacroF017.exv.out
index f952333d..263865ea 100644
--- a/test/data/test_reference_files/TamronSP90mmF2.8DiVCUSDMacroF017.exv.out
+++ b/test/data/test_reference_files/TamronSP90mmF2.8DiVCUSDMacroF017.exv.out
@@ -186,7 +186,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      32    
 Exif.Photo.BodySerialNumber                  Ascii      13  043022015995  043022015995
-Exif.Photo.LensSpecification                 Rational    4  90/1 90/1 0/0 0/0  90mm 
+Exif.Photo.LensSpecification                 Rational    4  90/1 90/1 0/0 0/0  90mm
 Exif.Photo.LensModel                         Ascii      70  TAMRON SP 90mm F/2.8 Di VC USD MACRO1:1 F017  TAMRON SP 90mm F/2.8 Di VC USD MACRO1:1 F017
 Exif.Photo.LensSerialNumber                  Ascii      12  0000000000  0000000000
 Exif.Photo.Gamma                             Rational    1  22/10  2.2
diff --git a/test/data/test_reference_files/canon_ef_100_400mm_f4.5_5.6_2x_.exv.out b/test/data/test_reference_files/canon_ef_100_400mm_f4.5_5.6_2x_.exv.out
index 6ff95597..e0834493 100644
--- a/test/data/test_reference_files/canon_ef_100_400mm_f4.5_5.6_2x_.exv.out
+++ b/test/data/test_reference_files/canon_ef_100_400mm_f4.5_5.6_2x_.exv.out
@@ -223,7 +223,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      16  Martin Straeten  Martin Straeten
 Exif.Photo.BodySerialNumber                  Ascii      13  143055002120  143055002120
-Exif.Photo.LensSpecification                 Rational    4  200/1 800/1 0/1 0/1  200-800mm F0
+Exif.Photo.LensSpecification                 Rational    4  200/1 800/1 0/1 0/1  200-800mm
 Exif.Photo.LensModel                         Ascii      37  EF100-400mm f/4.5-5.6L IS II USM +2x  EF100-400mm f/4.5-5.6L IS II USM +2x
 Exif.Photo.LensSerialNumber                  Ascii      11  3490009075  3490009075
 Exif.Image.GPSTag                            Long        1  43202  43202
diff --git a/test/data/test_reference_files/exiv2-SonyDSC-HX60V.exv.out b/test/data/test_reference_files/exiv2-SonyDSC-HX60V.exv.out
index 4f90ef5e..162de150 100644
--- a/test/data/test_reference_files/exiv2-SonyDSC-HX60V.exv.out
+++ b/test/data/test_reference_files/exiv2-SonyDSC-HX60V.exv.out
@@ -130,5 +130,5 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  430/100 12900/100 35/10 63/10  4-129mm F3.5-6.3
+Exif.Photo.LensSpecification                 Rational    4  430/100 12900/100 35/10 63/10  4.3-129mm F3.5-6.3
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
diff --git a/test/data/test_reference_files/exiv2-SonyDSC-RX100M5A.exv.out b/test/data/test_reference_files/exiv2-SonyDSC-RX100M5A.exv.out
index 20b9d378..cecdb01d 100644
--- a/test/data/test_reference_files/exiv2-SonyDSC-RX100M5A.exv.out
+++ b/test/data/test_reference_files/exiv2-SonyDSC-RX100M5A.exv.out
@@ -131,7 +131,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  880/100 2570/100 18/10 28/10  8-25mm F1.8-2.8
+Exif.Photo.LensSpecification                 Rational    4  880/100 2570/100 18/10 28/10  8.8-25.7mm F1.8-2.8
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
 Exif.Thumbnail.Compression                   Short       1  6  JPEG (old-style)
 Exif.Thumbnail.ImageDescription              Ascii      32                                                                  
diff --git a/test/data/test_reference_files/exiv2-bug1024.exv.out b/test/data/test_reference_files/exiv2-bug1024.exv.out
index 719af104..48f3090e 100644
--- a/test/data/test_reference_files/exiv2-bug1024.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1024.exv.out
@@ -196,7 +196,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  093026001758  093026001758
-Exif.Photo.LensSpecification                 Rational    4  300/1 1000/1 0/1 0/1  300-1000mm F0
+Exif.Photo.LensSpecification                 Rational    4  300/1 1000/1 0/1 0/1  300-1000mm
 Exif.Photo.LensModel                         Ascii      11  300-1000mm  300-1000mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  8934  8934
diff --git a/test/data/test_reference_files/exiv2-bug1122.exv.out b/test/data/test_reference_files/exiv2-bug1122.exv.out
index 719af104..48f3090e 100644
--- a/test/data/test_reference_files/exiv2-bug1122.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1122.exv.out
@@ -196,7 +196,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  093026001758  093026001758
-Exif.Photo.LensSpecification                 Rational    4  300/1 1000/1 0/1 0/1  300-1000mm F0
+Exif.Photo.LensSpecification                 Rational    4  300/1 1000/1 0/1 0/1  300-1000mm
 Exif.Photo.LensModel                         Ascii      11  300-1000mm  300-1000mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  8934  8934
diff --git a/test/data/test_reference_files/exiv2-bug1145b.exv.out b/test/data/test_reference_files/exiv2-bug1145b.exv.out
index 09dca621..79ea22e4 100644
--- a/test/data/test_reference_files/exiv2-bug1145b.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1145b.exv.out
@@ -98,7 +98,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  0/10 0/10 0/10 0/10  0mm F0
+Exif.Photo.LensSpecification                 Rational    4  0/10 0/10 0/10 0/10  n/a
 Exif.Photo.LensModel                         Ascii       5  ----  ----
 Exif.Image.GPSTag                            Long        1  21004  21004
 Exif.GPSInfo.GPSVersionID                    Byte        4  2 3 0 0  2.3.0.0
diff --git a/test/data/test_reference_files/exiv2-bug1145c.exv.out b/test/data/test_reference_files/exiv2-bug1145c.exv.out
index f8e8c4cd..377de588 100644
--- a/test/data/test_reference_files/exiv2-bug1145c.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1145c.exv.out
@@ -98,7 +98,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  0/10 0/10 0/10 0/10  0mm F0
+Exif.Photo.LensSpecification                 Rational    4  0/10 0/10 0/10 0/10  n/a
 Exif.Photo.LensModel                         Ascii       5  ----  ----
 Exif.Image.GPSTag                            Long        1  21004  21004
 Exif.GPSInfo.GPSVersionID                    Byte        4  2 3 0 0  2.3.0.0
diff --git a/test/data/test_reference_files/exiv2-bug1166.exv.out b/test/data/test_reference_files/exiv2-bug1166.exv.out
index b341685f..7b78c858 100644
--- a/test/data/test_reference_files/exiv2-bug1166.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1166.exv.out
@@ -199,7 +199,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  153026000424  153026000424
-Exif.Photo.LensSpecification                 Rational    4  11/1 20/1 0/1 0/1  11-20mm F0
+Exif.Photo.LensSpecification                 Rational    4  11/1 20/1 0/1 0/1  11-20mm
 Exif.Photo.LensModel                         Ascii       8  11-20mm  11-20mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  9400  9400
diff --git a/test/data/test_reference_files/exiv2-bug1167.exv.out b/test/data/test_reference_files/exiv2-bug1167.exv.out
index 1baec0c4..673251ce 100644
--- a/test/data/test_reference_files/exiv2-bug1167.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1167.exv.out
@@ -199,7 +199,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  153026000424  153026000424
-Exif.Photo.LensSpecification                 Rational    4  17/1 70/1 0/1 0/1  17-70mm F0
+Exif.Photo.LensSpecification                 Rational    4  17/1 70/1 0/1 0/1  17-70mm
 Exif.Photo.LensModel                         Ascii       8  17-70mm  17-70mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  9400  9400
diff --git a/test/data/test_reference_files/exiv2-bug1170.exv.out b/test/data/test_reference_files/exiv2-bug1170.exv.out
index 9b613e04..1719ea64 100644
--- a/test/data/test_reference_files/exiv2-bug1170.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1170.exv.out
@@ -196,7 +196,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  053024015642  053024015642
-Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm
 Exif.Photo.LensModel                         Ascii       5  35mm  35mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.DateTimeOriginal                  Ascii      20  2016:03:22 12:58:55  2016:03:22 12:58:55
diff --git a/test/data/test_reference_files/exiv2-bug1225.exv.out b/test/data/test_reference_files/exiv2-bug1225.exv.out
index 3fd983d7..711e97bb 100644
--- a/test/data/test_reference_files/exiv2-bug1225.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1225.exv.out
@@ -70,7 +70,7 @@ Exif.NikonIi.ISO2                            Byte        1  72  200
 Exif.NikonIi.ISOExpansion2                   Short       1  0  Off
 Exif.Nikon3.ShutterMode                      Short       1  16  Electronic
 Exif.Nikon3.LensType                         Byte        1  16  (16)
-Exif.Nikon3.Lens                             Rational    4  110/10 275/10 35/10 56/10  11-27mm F3.5-5.6
+Exif.Nikon3.Lens                             Rational    4  110/10 275/10 35/10 56/10  11-27.5mm F3.5-5.6
 Exif.Nikon3.FlashMode                        Byte        1  0  Did not fire
 Exif.Nikon3.ShootingMode                     Short       1  32  Single-frame, Auto ISO
 Exif.Nikon3.AutoBracketRelease               Short       1  1  Auto release
diff --git a/test/data/test_reference_files/exiv2-bug1252a.exv.out b/test/data/test_reference_files/exiv2-bug1252a.exv.out
index e4a23d20..6a2baf0d 100644
--- a/test/data/test_reference_files/exiv2-bug1252a.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1252a.exv.out
@@ -213,7 +213,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  148024000654  148024000654
-Exif.Photo.LensSpecification                 Rational    4  120/1 300/1 0/1 0/1  120-300mm F0
+Exif.Photo.LensSpecification                 Rational    4  120/1 300/1 0/1 0/1  120-300mm
 Exif.Photo.LensModel                         Ascii      10  120-300mm  120-300mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  9302  9302
diff --git a/test/data/test_reference_files/exiv2-bug1252b.exv.out b/test/data/test_reference_files/exiv2-bug1252b.exv.out
index f099c891..c04af587 100644
--- a/test/data/test_reference_files/exiv2-bug1252b.exv.out
+++ b/test/data/test_reference_files/exiv2-bug1252b.exv.out
@@ -213,7 +213,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  148024000654  148024000654
-Exif.Photo.LensSpecification                 Rational    4  150/1 500/1 0/1 0/1  150-500mm F0
+Exif.Photo.LensSpecification                 Rational    4  150/1 500/1 0/1 0/1  150-500mm
 Exif.Photo.LensModel                         Ascii      10  150-500mm  150-500mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  9302  9302
diff --git a/test/data/test_reference_files/exiv2-g20.exv.out b/test/data/test_reference_files/exiv2-g20.exv.out
index f952333d..263865ea 100644
--- a/test/data/test_reference_files/exiv2-g20.exv.out
+++ b/test/data/test_reference_files/exiv2-g20.exv.out
@@ -186,7 +186,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      32    
 Exif.Photo.BodySerialNumber                  Ascii      13  043022015995  043022015995
-Exif.Photo.LensSpecification                 Rational    4  90/1 90/1 0/0 0/0  90mm 
+Exif.Photo.LensSpecification                 Rational    4  90/1 90/1 0/0 0/0  90mm
 Exif.Photo.LensModel                         Ascii      70  TAMRON SP 90mm F/2.8 Di VC USD MACRO1:1 F017  TAMRON SP 90mm F/2.8 Di VC USD MACRO1:1 F017
 Exif.Photo.LensSerialNumber                  Ascii      12  0000000000  0000000000
 Exif.Photo.Gamma                             Rational    1  22/10  2.2
diff --git a/test/data/test_reference_files/exiv2-pr2323_coverage10.exv.out b/test/data/test_reference_files/exiv2-pr2323_coverage10.exv.out
index 9a801c8d..fd33c957 100644
--- a/test/data/test_reference_files/exiv2-pr2323_coverage10.exv.out
+++ b/test/data/test_reference_files/exiv2-pr2323_coverage10.exv.out
@@ -131,7 +131,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  880/100 7330/100 28/10 28/10  8-73mm F2.8
+Exif.Photo.LensSpecification                 Rational    4  880/100 7330/100 28/10 28/10  8.8-73.3mm F2.8
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
 Exif.Thumbnail.Compression                   Short       1  6  JPEG (old-style)
 Exif.Thumbnail.ImageDescription              Ascii      32                                                                  
diff --git a/test/data/test_reference_files/exiv2-pr2323_coverage2.exv.out b/test/data/test_reference_files/exiv2-pr2323_coverage2.exv.out
index c1cb2ff8..1ed2be64 100644
--- a/test/data/test_reference_files/exiv2-pr2323_coverage2.exv.out
+++ b/test/data/test_reference_files/exiv2-pr2323_coverage2.exv.out
@@ -133,7 +133,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  940/100 2570/100 18/10 28/10  9-25mm F1.8-2.8
+Exif.Photo.LensSpecification                 Rational    4  940/100 2570/100 18/10 28/10  9.4-25.7mm F1.8-2.8
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
 Exif.Thumbnail.Compression                   Short       1  6  JPEG (old-style)
 Exif.Thumbnail.ImageDescription              Ascii      32                                                                  
diff --git a/test/data/test_reference_files/exiv2-pr2323_coverage3.exv.out b/test/data/test_reference_files/exiv2-pr2323_coverage3.exv.out
index 06dddd08..17a1aace 100644
--- a/test/data/test_reference_files/exiv2-pr2323_coverage3.exv.out
+++ b/test/data/test_reference_files/exiv2-pr2323_coverage3.exv.out
@@ -136,7 +136,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  880/100 2570/100 18/10 28/10  8-25mm F1.8-2.8
+Exif.Photo.LensSpecification                 Rational    4  880/100 2570/100 18/10 28/10  8.8-25.7mm F1.8-2.8
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
 Exif.Thumbnail.Compression                   Short       1  6  JPEG (old-style)
 Exif.Thumbnail.ImageDescription              Ascii      32                                                                  
diff --git a/test/data/test_reference_files/exiv2-pr317.exv.out b/test/data/test_reference_files/exiv2-pr317.exv.out
index 771b231a..28dbd4fd 100644
--- a/test/data/test_reference_files/exiv2-pr317.exv.out
+++ b/test/data/test_reference_files/exiv2-pr317.exv.out
@@ -180,7 +180,7 @@ Exif.Photo.DigitalZoomRatio                  Rational    1  6000/6000  1.0
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  613050001534  613050001534
-Exif.Photo.LensSpecification                 Rational    4  15/1 45/1 0/1 0/1  15-45mm F0
+Exif.Photo.LensSpecification                 Rational    4  15/1 45/1 0/1 0/1  15-45mm
 Exif.Photo.LensModel                         Ascii      29  EF-M15-45mm f/3.5-6.3 IS STM  EF-M15-45mm f/3.5-6.3 IS STM
 Exif.Photo.LensSerialNumber                  Ascii      11  000002544e  000002544e
 Exif.Image.GPSTag                            Long        1  15884  15884
diff --git a/test/data/test_reference_files/issue_1782_canon_lens_sigma_30mm_f1.4_DC_DN_C.exv.out b/test/data/test_reference_files/issue_1782_canon_lens_sigma_30mm_f1.4_DC_DN_C.exv.out
index cdc2cc30..71c7a964 100644
--- a/test/data/test_reference_files/issue_1782_canon_lens_sigma_30mm_f1.4_DC_DN_C.exv.out
+++ b/test/data/test_reference_files/issue_1782_canon_lens_sigma_30mm_f1.4_DC_DN_C.exv.out
@@ -197,7 +197,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii      12  Danny Heijl  Danny Heijl
 Exif.Photo.BodySerialNumber                  Ascii      13  693035001174  693035001174
-Exif.Photo.LensSpecification                 Rational    4  30/1 30/1 0/1 0/1  30mm F0
+Exif.Photo.LensSpecification                 Rational    4  30/1 30/1 0/1 0/1  30mm
 Exif.Photo.LensModel                         Ascii      35  30mm F1.4 DC DN | Contemporary 016  30mm F1.4 DC DN | Contemporary 016
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  6426  6426
diff --git a/test/data/test_reference_files/pr_2216.exv.out b/test/data/test_reference_files/pr_2216.exv.out
index 5c0a817e..f390f541 100644
--- a/test/data/test_reference_files/pr_2216.exv.out
+++ b/test/data/test_reference_files/pr_2216.exv.out
@@ -230,7 +230,7 @@ Exif.Photo.WhiteBalance                      Short       1  0  Auto
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  403022001947  403022001947
-Exif.Photo.LensSpecification                 Rational    4  24/1 105/1 0/1 0/1  24-105mm F0
+Exif.Photo.LensSpecification                 Rational    4  24/1 105/1 0/1 0/1  24-105mm
 Exif.Photo.LensModel                         Ascii      25  RF24-105mm F4-7.1 IS STM  RF24-105mm F4-7.1 IS STM
 Exif.Photo.LensSerialNumber                  Ascii      11  000002a620  000002a620
 Exif.Image.GPSTag                            Long        1  10982  10982
diff --git a/test/data/test_reference_files/test_issue_1464.exv.out b/test/data/test_reference_files/test_issue_1464.exv.out
index 060876cd..b618b71d 100644
--- a/test/data/test_reference_files/test_issue_1464.exv.out
+++ b/test/data/test_reference_files/test_issue_1464.exv.out
@@ -147,7 +147,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  1040/100 3710/100 18/10 49/10  10-37mm F1.8-4.9
+Exif.Photo.LensSpecification                 Rational    4  1040/100 3710/100 18/10 49/10  10.4-37.1mm F1.8-4.9
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
 Exif.Thumbnail.Compression                   Short       1  6  JPEG (old-style)
 Exif.Thumbnail.ImageDescription              Ascii      32                                                                  
diff --git a/test/data/test_reference_files/test_issue_1471.exv.out b/test/data/test_reference_files/test_issue_1471.exv.out
index 060876cd..b618b71d 100644
--- a/test/data/test_reference_files/test_issue_1471.exv.out
+++ b/test/data/test_reference_files/test_issue_1471.exv.out
@@ -147,7 +147,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  1040/100 3710/100 18/10 49/10  10-37mm F1.8-4.9
+Exif.Photo.LensSpecification                 Rational    4  1040/100 3710/100 18/10 49/10  10.4-37.1mm F1.8-4.9
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
 Exif.Thumbnail.Compression                   Short       1  6  JPEG (old-style)
 Exif.Thumbnail.ImageDescription              Ascii      32                                                                  
diff --git a/test/data/test_reference_files/test_issue_1472.jpg.out b/test/data/test_reference_files/test_issue_1472.jpg.out
index 060876cd..b618b71d 100644
--- a/test/data/test_reference_files/test_issue_1472.jpg.out
+++ b/test/data/test_reference_files/test_issue_1472.jpg.out
@@ -147,7 +147,7 @@ Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.Contrast                          Short       1  0  Normal
 Exif.Photo.Saturation                        Short       1  0  Normal
 Exif.Photo.Sharpness                         Short       1  0  Normal
-Exif.Photo.LensSpecification                 Rational    4  1040/100 3710/100 18/10 49/10  10-37mm F1.8-4.9
+Exif.Photo.LensSpecification                 Rational    4  1040/100 3710/100 18/10 49/10  10.4-37.1mm F1.8-4.9
 Exif.Image.PrintImageMatching                Undefined  28  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0  80 114 105 110 116 73 77 0 48 51 48 48 0 0 2 0 2 0 1 0 0 0 1 1 1 0 0 0
 Exif.Thumbnail.Compression                   Short       1  6  JPEG (old-style)
 Exif.Thumbnail.ImageDescription              Ascii      32                                                                  
diff --git a/test/data/test_reference_files/test_issue_981b.exv.out b/test/data/test_reference_files/test_issue_981b.exv.out
index 58b6e7b3..abe96ca3 100644
--- a/test/data/test_reference_files/test_issue_981b.exv.out
+++ b/test/data/test_reference_files/test_issue_981b.exv.out
@@ -219,7 +219,7 @@ Exif.Photo.WhiteBalance                      Short       1  1  Manual
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  263057004424  263057004424
-Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm
 Exif.Photo.LensModel                         Ascii      27  35mm F1.4 DG HSM | Art 012  35mm F1.4 DG HSM | Art 012
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  10476  10476
diff --git a/test/data/test_reference_files/test_issue_981c.exv.out b/test/data/test_reference_files/test_issue_981c.exv.out
index 899b362b..3c804f4a 100644
--- a/test/data/test_reference_files/test_issue_981c.exv.out
+++ b/test/data/test_reference_files/test_issue_981c.exv.out
@@ -223,7 +223,7 @@ Exif.Photo.WhiteBalance                      Short       1  1  Manual
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  263057004424  263057004424
-Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm F0
+Exif.Photo.LensSpecification                 Rational    4  35/1 35/1 0/1 0/1  35mm
 Exif.Photo.LensModel                         Ascii      27  35mm F1.4 DG HSM | Art 012  35mm F1.4 DG HSM | Art 012
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  43156  43156
diff --git a/test/data/test_reference_files/test_issue_981d.exv.out b/test/data/test_reference_files/test_issue_981d.exv.out
index 2d77a03e..fdc56409 100644
--- a/test/data/test_reference_files/test_issue_981d.exv.out
+++ b/test/data/test_reference_files/test_issue_981d.exv.out
@@ -223,7 +223,7 @@ Exif.Photo.WhiteBalance                      Short       1  1  Manual
 Exif.Photo.SceneCaptureType                  Short       1  0  Standard
 Exif.Photo.CameraOwnerName                   Ascii       1    
 Exif.Photo.BodySerialNumber                  Ascii      13  263057004424  263057004424
-Exif.Photo.LensSpecification                 Rational    4  28/1 80/1 0/1 0/1  28-80mm F0
+Exif.Photo.LensSpecification                 Rational    4  28/1 80/1 0/1 0/1  28-80mm
 Exif.Photo.LensModel                         Ascii      20  EF28-80mm f/3.5-5.6  EF28-80mm f/3.5-5.6
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000  0000000000
 Exif.Image.GPSTag                            Long        1  43148  43148
diff --git a/tests/bash_tests/test_Photo_LensSpecification.py b/tests/bash_tests/test_Photo_LensSpecification.py
new file mode 100644
index 00000000..a1ce831e
--- /dev/null
+++ b/tests/bash_tests/test_Photo_LensSpecification.py
@@ -0,0 +1,284 @@
+# -*- coding: utf-8 -*-
+
+from system_tests import CaseMeta, CopyTmpFiles, path
+
+#####################################################################
+# Standard cases (correct values)
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecificationCorrect(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification 1000/10 1000/10 28/10 28/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 280/10 700/10 28/10 28/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 280/10 700/10 28/10 40/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 28/10 70/10 28/10 40/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "1000/10 1000/10 28/10 28/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  100mm F2.8
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "280/10 700/10 28/10 28/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  28-70mm F2.8
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "280/10 700/10 28/10 40/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  28-70mm F2.8-4
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "28/10 70/10 28/10 40/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  2.8-7mm F2.8-4
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# empty lens specification (all zeros)
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecificationEmpty(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification 0/0 0/0 0/0 0/0" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "0/0 0/0 0/0 0/0" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  n/a
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# Exif.Photo.LensSpecification filled with wrong type: Ascii
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecificationAscii(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification Ascii 1/10 2/10 3/10 4/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "1/10 2/10 3/10 4/10" (Ascii)
+""",
+    """Exif.Photo.LensSpecification                 Ascii      20  (1/10 2/10 3/10 4/10)
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# Exif.Photo.LensSpecification filled with wrong type: Byte (4 values)
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecification4Byte(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification Byte 1 2 3 4" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "1 2 3 4" (Byte)
+""",
+    """Exif.Photo.LensSpecification                 Byte        4  (1 2 3 4)
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# Exif.Photo.LensSpecification filled with wrong number of values
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecification5Rational(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification 1/10 2/10 3/10 4/10 5/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "1/10 2/10 3/10 4/10 5/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    5  (1/10 2/10 3/10 4/10 5/10)
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# divisor is zero
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecificationZeroDevisor(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification 1/0 2/10 3/10 4/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 1/10 2/0 3/10 4/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 1/10 2/10 3/0 4/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 1/10 2/10 3/10 4/0" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "1/0 2/10 3/10 4/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  (1/0 2/10 3/10 4/10)
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "1/10 2/0 3/10 4/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  (1/10 2/0 3/10 4/10)
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "1/10 2/10 3/0 4/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  (1/10 2/10 3/0 4/10)
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "1/10 2/10 3/10 4/0" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  (1/10 2/10 3/10 4/0)
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# dividend is zero
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecificationZeroDevidend(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification 0/10 200/10 33/10 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 100/10 0/10 33/10 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 100/10 200/10 0/10 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 100/10 200/10 33/10 0/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "0/10 200/10 33/10 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  n/a-20mm F3.3-4.4
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "100/10 0/10 33/10 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  10-n/a mm F3.3-4.4
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "100/10 200/10 0/10 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  10-20mm F n/a-4.4
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "100/10 200/10 33/10 0/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  10-20mm F3.3-n/a
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# dividend and divisor is zero
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecificationZeroDevidendDivisior(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification 0/0 200/10 33/10 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 100/10 0/0 33/10 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 100/10 200/10 0/0 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 100/10 200/10 33/10 0/0" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "0/0 200/10 33/10 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  n/a-20mm F3.3-4.4
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "100/10 0/0 33/10 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  10-n/a mm F3.3-4.4
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "100/10 200/10 0/0 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  10-20mm F n/a-4.4
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "100/10 200/10 33/10 0/0" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  10-20mm F3.3-n/a
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
+#####################################################################
+# first value bigger than second
+#####################################################################
+@CopyTmpFiles("$data_path/exiv2-empty.jpg")
+class LensSpecificationFirstBiggerSecond(metaclass=CaseMeta):
+
+    filename = path("$tmp_path/exiv2-empty.jpg")
+
+    commands = [
+        """$exiv2 -u -v -M"add Exif.Photo.LensSpecification 2010/100 200/10 33/10 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename",
+        """$exiv2 -u -v -M"set Exif.Photo.LensSpecification 100/10 200/10 441/100 44/10" $filename""",
+        "$exiv2 -KExif.Photo.LensSpecification $filename"
+    ]
+    stdout = ["""File 1/1: $filename
+Add Exif.Photo.LensSpecification "2010/100 200/10 33/10 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  (2010/100 200/10 33/10 44/10)
+""",
+    """File 1/1: $filename
+Set Exif.Photo.LensSpecification "100/10 200/10 441/100 44/10" (Rational)
+""",
+    """Exif.Photo.LensSpecification                 Rational    4  (100/10 200/10 441/100 44/10)
+"""
+    ]
+    stderr = [""] * len(commands)
+    retval = [0] * len(commands)
+
diff --git a/tests/bugfixes/github/test_issue_20.py b/tests/bugfixes/github/test_issue_20.py
index 68d8d32c..2d4dfb1b 100644
--- a/tests/bugfixes/github/test_issue_20.py
+++ b/tests/bugfixes/github/test_issue_20.py
@@ -27,7 +27,7 @@ class TamronSupport(metaclass=system_tests.CaseMeta):
 Exif.CanonCs.Lens                            Short       3  90.0 mm
 Exif.Canon.LensModel                         Ascii      70  TAMRON SP 90mm F/2.8 Di VC USD MACRO1:1 F017
 Exif.CanonLe.LensSerialNumber                SLong       1  0
-Exif.Photo.LensSpecification                 Rational    4  90mm 
+Exif.Photo.LensSpecification                 Rational    4  90mm
 Exif.Photo.LensModel                         Ascii      70  TAMRON SP 90mm F/2.8 Di VC USD MACRO1:1 F017
 Exif.Photo.LensSerialNumber                  Ascii      12  0000000000
 """,
diff --git a/tests/bugfixes/redmine/test_issue_1122.py b/tests/bugfixes/redmine/test_issue_1122.py
index d818c626..eb329176 100644
--- a/tests/bugfixes/redmine/test_issue_1122.py
+++ b/tests/bugfixes/redmine/test_issue_1122.py
@@ -23,7 +23,7 @@ class CheckLensDetectionTeleconverter(metaclass=system_tests.CaseMeta):
 Exif.CanonCs.Lens                            Short       3  300.0 - 1000.0 mm
 Exif.Canon.LensModel                         Ascii      74  300-1000mm
 Exif.CanonLe.LensSerialNumber                SLong       1  0
-Exif.Photo.LensSpecification                 Rational    4  300-1000mm F0
+Exif.Photo.LensSpecification                 Rational    4  300-1000mm
 Exif.Photo.LensModel                         Ascii      11  300-1000mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000
 """
diff --git a/tests/bugfixes/redmine/test_issue_1145.py b/tests/bugfixes/redmine/test_issue_1145.py
index 9369eed9..3c1fa0a0 100644
--- a/tests/bugfixes/redmine/test_issue_1145.py
+++ b/tests/bugfixes/redmine/test_issue_1145.py
@@ -27,12 +27,12 @@ Exif.Photo.LensModel                         Ascii      20  DT 11-18mm F4.5-5.6
 """,
               """Exif.Sony1.LensID                            Long        1  Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical
 Exif.Sony1.LensSpec                          Byte        8  Unknown
-Exif.Photo.LensSpecification                 Rational    4  0mm F0
+Exif.Photo.LensSpecification                 Rational    4  n/a
 Exif.Photo.LensModel                         Ascii       5  ----
 """,
               """Exif.Sony1.LensID                            Long        1  Tamron AF 18-200mm F3.5-6.3 XR Di II LD Aspherical [IF] Macro
 Exif.Sony1.LensSpec                          Byte        8  Unknown
-Exif.Photo.LensSpecification                 Rational    4  0mm F0
+Exif.Photo.LensSpecification                 Rational    4  n/a
 Exif.Photo.LensModel                         Ascii       5  ----
 """,
               """Exif.Sony1.LensID                            Long        1  Tamron SP 70-300mm F4-5.6 Di USD
diff --git a/tests/bugfixes/redmine/test_issue_1166.py b/tests/bugfixes/redmine/test_issue_1166.py
index 698b3c0f..906643b7 100644
--- a/tests/bugfixes/redmine/test_issue_1166.py
+++ b/tests/bugfixes/redmine/test_issue_1166.py
@@ -14,7 +14,7 @@ class CheckTokina11_20mm(metaclass=system_tests.CaseMeta):
 Exif.CanonCs.Lens                            Short       3  11.0 - 20.0 mm
 Exif.Canon.LensModel                         Ascii      74  11-20mm
 Exif.CanonLe.LensSerialNumber                SLong       1  0
-Exif.Photo.LensSpecification                 Rational    4  11-20mm F0
+Exif.Photo.LensSpecification                 Rational    4  11-20mm
 Exif.Photo.LensModel                         Ascii       8  11-20mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000
 """,
diff --git a/tests/bugfixes/redmine/test_issue_1167.py b/tests/bugfixes/redmine/test_issue_1167.py
index c136e677..2a0e9bd0 100644
--- a/tests/bugfixes/redmine/test_issue_1167.py
+++ b/tests/bugfixes/redmine/test_issue_1167.py
@@ -14,7 +14,7 @@ class CheckSigma17_70Lens(metaclass=system_tests.CaseMeta):
 Exif.CanonCs.Lens                            Short       3  17.0 - 70.0 mm
 Exif.Canon.LensModel                         Ascii      74  17-70mm
 Exif.CanonLe.LensSerialNumber                SLong       1  0
-Exif.Photo.LensSpecification                 Rational    4  17-70mm F0
+Exif.Photo.LensSpecification                 Rational    4  17-70mm
 Exif.Photo.LensModel                         Ascii       8  17-70mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000
 """,
diff --git a/tests/bugfixes/redmine/test_issue_1170.py b/tests/bugfixes/redmine/test_issue_1170.py
index b186acb6..4741321e 100644
--- a/tests/bugfixes/redmine/test_issue_1170.py
+++ b/tests/bugfixes/redmine/test_issue_1170.py
@@ -14,7 +14,7 @@ class CheckSigma35mm(metaclass=system_tests.CaseMeta):
 Exif.CanonCs.Lens                            Short       3  35.0 mm
 Exif.Canon.LensModel                         Ascii      74  35mm
 Exif.CanonLe.LensSerialNumber                SLong       1  0
-Exif.Photo.LensSpecification                 Rational    4  35mm F0
+Exif.Photo.LensSpecification                 Rational    4  35mm
 Exif.Photo.LensModel                         Ascii       5  35mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000
 """,
diff --git a/tests/bugfixes/redmine/test_issue_1252.py b/tests/bugfixes/redmine/test_issue_1252.py
index 0b06cbe3..8f85a111 100644
--- a/tests/bugfixes/redmine/test_issue_1252.py
+++ b/tests/bugfixes/redmine/test_issue_1252.py
@@ -22,7 +22,7 @@ Exif.Canon.LensModel                         Ascii      74  120-300mm
 Exif.CanonLe.LensSerialNumber                SLong       1  0
 Exif.CanonAfC.USMLensElectronicMF            SLong       1  Enable After AF
 Exif.CanonAfC.LensDriveWhenAFImpossible      SLong       1  Continue Focus Search
-Exif.Photo.LensSpecification                 Rational    4  120-300mm F0
+Exif.Photo.LensSpecification                 Rational    4  120-300mm
 Exif.Photo.LensModel                         Ascii      10  120-300mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000
 """,
@@ -32,7 +32,7 @@ Exif.Canon.LensModel                         Ascii      74  150-500mm
 Exif.CanonLe.LensSerialNumber                SLong       1  0
 Exif.CanonAfC.USMLensElectronicMF            SLong       1  Enable After AF
 Exif.CanonAfC.LensDriveWhenAFImpossible      SLong       1  Continue Focus Search
-Exif.Photo.LensSpecification                 Rational    4  150-500mm F0
+Exif.Photo.LensSpecification                 Rational    4  150-500mm
 Exif.Photo.LensModel                         Ascii      10  150-500mm
 Exif.Photo.LensSerialNumber                  Ascii      11  0000000000
 """