Exif_0x(hex number)? Canon_0x(hex number)?

[Kevin P. Neal]

My apologies in advance if this is a dumb or tired question.

I'm running exiftool 9.70 on OS X 10.9.4. I have not rebooted since installing the newest exiftool, if it matters. I've got a Canon 5DmkIII firmware 1.2.3.

I'm looking at some pictures I took and I'm seeing this:
mm12a:06 kpn$ exiftool -a -e -u -G -args 892B1526.CR2 | grep 0x
-EXIF:Exif_0xc5d9=2
-EXIF:Exif_0xc6c5=3
-EXIF:Exif_0xc6dc=577 386 14 9
-EXIF:Exif_0xc5d8=1
-EXIF:Exif_0xc5e0=1
-EXIF:Exif_0xc6c5=1
-MakerNotes:Canon_0x0019=1
-MakerNotes:Canon_0x4009=0 0 0
-MakerNotes:Canon_0x4011=[...]
-MakerNotes:Canon_0x4012=
-MakerNotes:Canon_0x4021=20 0 0 0 1
-MakerNotes:Canon_0x4025=36 0 0 0 0 0 0 0 0
-MakerNotes:Canon_0x4027=20 589825 2795700276 121374208 13684944
-MakerNotes:Canon_0x4028=76 0 0 0 0 0 0 0 0 0 0 0 63 0 1 0 0 1 0
mm12a:06 kpn$

Any ideas on what those hex numbers actually mean? Oh, and don't say "unknown". Attached is the full output of exiftool.

[Hayo Baan]

Because you specified the -u flag, exiftool will also show you information for tags it has no knowledge about. So yes, those hex numbers indeed indicate unknown tags (with the given id number in hex). If you don't add -u, you won't get them any longer

Oh, and if you know which of those means what, be sure to tell Phil so he can add it to exiftool.