Based upon a StackOverflow (https://stackoverflow.com/questions/46929082/exiftool-focal-length-in-35-mm-is-not-copied-from-the-src-to-destination) question.
I start with a jpg with no exifdata. Copy FocalLengthIn35mmFormat to the empty file from another file using -TagsFromFile. The tag appears to copy correctly and exiftool shows it upon listing the EXIF contents. But testing with Irfanview, Adobe Bridge, and the program mentioned in that link (AnalongExif (http://analogexif.sourceforge.net/help/)) do not show FocalLengthIn35mmFormat in the target file, though they show it in the source file. The source file had it's EXIF data filled with exiftool.
Bug? Or are the other programs maybe relying upon another tag as well? Let me know if you need to see the files.
Hi StarGeek,
I can't reproduce this.
Adobe Bridge CS4 sees "Focal Length in 35mm Film" if I write FocalLengthIn35mmFormat into a JPEG with no other metadata.
I suggest deleting tags from the source file until you find out which one(s) cause this difference.
- Phil
Dang it, now I can't reproduce it.