diff --git a/rtengine/imagedata.cc b/rtengine/imagedata.cc
index b4058e56e..d6b643bcd 100644
--- a/rtengine/imagedata.cc
+++ b/rtengine/imagedata.cc
@@ -766,10 +766,14 @@ void FramesData::fillBasicTags(Exiv2::ExifData &exif) const
         return;
     }
     set_exif(exif, "Exif.Photo.ISOSpeedRatings", getISOSpeed());
-    set_exif(exif, "Exif.Photo.FNumber", Exiv2::DoubleValue(getFNumber()));
-    set_exif(exif, "Exif.Photo.ExposureTime", Exiv2::DoubleValue(getShutterSpeed()));
-    set_exif(exif, "Exif.Photo.FocalLength", Exiv2::DoubleValue(getFocalLen()));
-    set_exif(exif, "Exif.Photo.ExposureBiasValue", Exiv2::DoubleValue(getExpComp()));
+    set_exif(exif, "Exif.Photo.FNumber", Exiv2::URationalValue(Exiv2::URational(round(getFNumber() * 10), 10)));
+    auto s = shutterToString(getShutterSpeed());
+    if (s.find('/') == std::string::npos) {
+        s += "/1";
+    }
+    set_exif(exif, "Exif.Photo.ExposureTime", s);
+    set_exif(exif, "Exif.Photo.FocalLength", Exiv2::URationalValue(Exiv2::URational(getFocalLen() * 10, 10)));
+    set_exif(exif, "Exif.Photo.ExposureBiasValue", Exiv2::DoubleValue(round(getExpComp() * 100) / 100.0));
     set_exif(exif, "Exif.Image.Make", getMake());
     set_exif(exif, "Exif.Image.Model", getModel());
     set_exif(exif, "Exif.Photo.LensModel", getLens());