Firmware Versions, Canon 7D (or - strangeness recovering certain data)

[phut]

Processing old photos from an obsolete canon 7D in exiftool gives warnings:

Warning: Unrecognized CameraInfo7D firmware version

because:

CanonFirmwareVersion : Firmware Version 2.0.3

Latest version from Canon Website is 2.0.6.

From the available data I have, all photos having 1.x.x firmware are not flagged.
Firmware 2.x.x adds some useful functionality over 1.x.x

I don't know how many other intermediate 2.x.x minor version numbers were previously available.

[phut]

With further testing*, I am no longer sure the warning and tag CanonFirmwareVersion are linked.

• I used exiftool to copy a version number string from a "working" file to one that was producing warnings, and used exiftool again to make sure that it had applied correctly. The file still produces the same warning when scanned with exiftool.

[phut]

Further - Warning message only seems to be issued if (even unrelated) XMP data is called for, and seems to only occur if the XMP data is not available. I'll leave this here for your entertainment but I'd close this one as some hideous edge case.

$ exiftool IMG_7189.jpg -Rating
Rating                          : 0
$ exiftool IMG_7189.jpg -XMP:Rating
Warning: Unrecognized CameraInfo7D firmware version - IMG_7189.jpg
$ exiftool IMG_7189.jpg -XMP:Rating=1
    1 image files updated
$ exiftool IMG_7189.jpg -XMP:Rating
Rating                          : 1