*.THM files in RAW mode

I used ExifPro Image Viewer from here: http://www.exifpro.com​/

There's a none pro version here: http://home.pacbell.ne​t/michal_k/exif_v.html

Don't forget to put the THM and the CRW files in different folders to see the actual EXIF info for each.

PacAce, I think the problem you're having is with your sofware. Photoshop CS file browser shows the list of information I made above from a CRW file, I think the software you're using just isn't CRW compatible. I delete thm files so there's no chance it picked it up from one of them. The THM file does have more information, though I can't see any that i'd find useful.

Subject distance for one, and I believe the Canon Makernote data as well, which includes custom function settings, etc.

Tim, did you delete the cache and rebuild the thumbnail in PSCS?

I got similar results for the seperate raw file with that program, but couldn't get it to see the thm file by it self. I tried something I had started last night though. I took 2 pictures in RAW format on 2 different CF cards. On 1 I opened and converted it with the thm still on the card. With the other I deleted the thm file then opened and converted it. The data for them is the basically the same.

(I overlapped the screen shots to save space)

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You are also missing a lot of EXIF data there. The basic stuff is there in the RAW, yes, and many programs cannot read any of it as in PacAce's case, but the RAW is NOT a complete set of Canon EXIF information. Whether or not the missing information is of any value is another argument but the fact remains the THM has more EXIF information than the RAW alone.

BTW, if you want to see the EXIF information in a THM, rename it to JPG.

On a 10D you lose whatever Cfn settings you had. Everything other than Cfn settings is there, with or without the .thm file.

Nevertheless, we're talking 11-14Kb per photo. Not a big deal when drive space is about 50-75 cents a gig or so.

Subject distance is lost as well, along with more of the Canon Makernote data aside from custom functions.

Nope, I can give it a go if you'd like. I tend to delete thm files before I start PS CS, can't guarantee that in this case though.

Could but, but it's difficult to say for sure. Both the CRW with THM and the plain CRW ended up with the same amount of data. Photoshop seems to only read some of the EXIF. (Someone already mentioned that EXIF impementation isn't completely standardized). And the EXIF viewer wasn't able to get any EXIF from the plain CRW (which we know is there).

Also about the subject distance info. I read that that was a feature of ETTL-II and that it only worked with certain lenes.

Yeah, could be the EXIF's there and PS isn't reading it.

Re distance info, we're talking about recording it, not using it, though you're correct that ETTL II (not 1) uses it when the lens provides it.

OK. I took a RAW from my D60, moved the THMs into one directory and the CRW into a second using Windows Explorer (so no way ZB could get the info). I then viewed the "Properties" for the CRW using ZB 4.6. The THM files weren't visible in ZB. I shut down ZB, moved the THMs into the same directory as the CRWs, reopened ZB, refreshed, and the Properties displayed were the same. So whatever's there, Canon utilities see it with or without the THM.

BUT I opened a THM and the corresponding CRW with EXIFReader 3.0 and the information displayed was in markedly different format, and some of the named fields in the two files differed in value. For instance the ISO setting was 200 according to the THM but 100 in the CRW. IIRC, 200 was te correct value. The CRW didn't show (identified) values for shutter speed or aperture, which were listed in the THM. BR's EXIF Extractor 0.9 wasn't able to acquire any from either. So however the information is stored in the CRWs, it appears Canon knows how to get full EXIF info without needing the THM, but other programs can't read it.

Yeah I missed those. Thanks.