20D Photo Details Wrong

mercphotomercphoto Registered Users Posts: 4,550 Major grins
edited March 23, 2006 in SmugMug Support
The photo details of 20D photos are often wrong. For example, I know the flash and color space information is wrong. Don't know about exposure bias. And the focal length, while correct, has an incorrect "guess". The "in 35mm" should be 1.6 times the focal length. (the guess was wrong for the Rebel as well)
Bill Jurasz - Mercury Photography - Cedar Park, TX
A former sports shooter
Follow me at: https://www.flickr.com/photos/bjurasz/
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Comments

  • pathfinderpathfinder Super Moderators Posts: 14,708 moderator
    edited October 13, 2004
    mercphoto wrote:
    The photo details of 20D photos are often wrong. For example, I know the flash and color space information is wrong. Don't know about exposure bias. And the focal length, while correct, has an incorrect "guess". The "in 35mm" should be 1.6 times the focal length. (the guess was wrong for the Rebel as well)

    I think this has been true for the 10D all along also. Smugmug frequently describes the focal length as shorter than the actual lens focal length and on a 10D this is not correct as Merc has pointed out above.
    Pathfinder - www.pathfinder.smugmug.com

    Moderator of the Technique Forum and Finishing School on Dgrin
  • BaldyBaldy Registered Users, Super Moderators Posts: 2,853 moderator
    edited October 13, 2004
    pathfinder wrote:
    I think this has been true for the 10D all along also. Smugmug frequently describes the focal length as shorter than the actual lens focal length and on a 10D this is not correct as Merc has pointed out above.
    35mm equivalent is hard to guess accurately because the data we're given in EXIF requires a calculation. The caluculation is only accurate if you don't crop your images, and that's why we call it a guess.

    For anyone who wants the details, here you go:

    http://jalbum.net/forum/thread.jspa?messageID=21281
    My Smug Mug
  • miketaylor01miketaylor01 Registered Users Posts: 318 Major grins
    edited October 13, 2004
    general photo info question
    I only have a standard account so this may be why I cant figure out how to get this to work, but is there a way to display the camera info below every image instead of having to click on the photo info button?ne_nau.gif Kinda like they do it on PBase. Thanks

    Mike
    Mike

    Sigma SD9, SD14, and DP1
    http://miketaylor.giph.com
  • mercphotomercphoto Registered Users Posts: 4,550 Major grins
    edited October 13, 2004
    Focal length guessing game
    Baldy wrote:
    35mm equivalent is hard to guess accurately because the data we're given in EXIF requires a calculation. The caluculation is only accurate if you don't crop your images, and that's why we call it a guess.

    I never crop, and the calculation has never been right. :) Is there any reason to continue trying to guess, rather than just stating the focal length as given by the EXIF file? In other words, is there value in having a 35mm equivalent value for the focal length?
    Bill Jurasz - Mercury Photography - Cedar Park, TX
    A former sports shooter
    Follow me at: https://www.flickr.com/photos/bjurasz/
    My Etsy store: https://www.etsy.com/shop/mercphoto?ref=hdr_shop_menu
  • mercphotomercphoto Registered Users Posts: 4,550 Major grins
    edited October 13, 2004
    camera info
    miketaylor01 wrote:
    I only have a standard account so this may be why I cant figure out how to get this to work, but is there a way to display the camera info below every image instead of having to click on the photo info button?ne_nau.gif Kinda like they do it on PBase.

    Nope.
    Bill Jurasz - Mercury Photography - Cedar Park, TX
    A former sports shooter
    Follow me at: https://www.flickr.com/photos/bjurasz/
    My Etsy store: https://www.etsy.com/shop/mercphoto?ref=hdr_shop_menu
  • BaldyBaldy Registered Users, Super Moderators Posts: 2,853 moderator
    edited October 14, 2004
    mercphoto wrote:
    In other words, is there value in having a 35mm equivalent value for the focal length?
    We got tons of requests for it when we didn't have it. I'll have to check and see why the guess isn't correct without cropping on the 20D.
    My Smug Mug
  • mercphotomercphoto Registered Users Posts: 4,550 Major grins
    edited October 14, 2004
    20d
    Baldy wrote:
    We got tons of requests for it when we didn't have it. I'll have to check and see why the guess isn't correct without cropping on the 20D.

    It doesn't actually bother me per se. Was just bringing it up only because the info (focal length guess and flash setting) was wrong. I'd rather have work focused on other issues, unless other people are also wanting this same item fixed.

    Love the ability to block the display of large images. The new "bulk" tools are great. Only item on my personal wish list is the ability to track sales by gallery. I can retrieve the information myself by manually following the thumbnails back to the originating gallery from the sales detail list, but its a pain.
    Bill Jurasz - Mercury Photography - Cedar Park, TX
    A former sports shooter
    Follow me at: https://www.flickr.com/photos/bjurasz/
    My Etsy store: https://www.etsy.com/shop/mercphoto?ref=hdr_shop_menu
  • onethumbonethumb Administrators Posts: 1,269 Major grins
    edited October 14, 2004
    mercphoto wrote:
    It doesn't actually bother me per se. Was just bringing it up only because the info (focal length guess and flash setting) was wrong. I'd rather have work focused on other issues, unless other people are also wanting this same item fixed.

    Love the ability to block the display of large images. The new "bulk" tools are great. Only item on my personal wish list is the ability to track sales by gallery. I can retrieve the information myself by manually following the thumbnails back to the originating gallery from the sales detail list, but its a pain.

    I haven't actually taken a look at the EXIF data off of the 20D yet, but I'm pretty sure everything we display (except for the "guess") is pulled straight from the photo.

    So if there's stuff that's wrong, I think it's possibly a Canon bug or something.

    I'll look into it when I get a chance.

    Don
  • onethumbonethumb Administrators Posts: 1,269 Major grins
    edited October 14, 2004
    miketaylor01 wrote:
    I only have a standard account so this may be why I cant figure out how to get this to work, but is there a way to display the camera info below every image instead of having to click on the photo info button?ne_nau.gif Kinda like they do it on PBase. Thanks

    Mike

    This is the way we used to have it, but we got tons of complaints that it cluttered the page up too much and made it look unprofessional.

    Yours is the first I've heard since the change more than a year ago, I'm afraid.

    If you have any suggestions as to how we could appease both camps, I'm all ears, but the honest answer is that you're in the minority. :(

    Don
  • onethumbonethumb Administrators Posts: 1,269 Major grins
    edited October 14, 2004
    onethumb wrote:
    I haven't actually taken a look at the EXIF data off of the 20D yet, but I'm pretty sure everything we display (except for the "guess") is pulled straight from the photo.

    So if there's stuff that's wrong, I think it's possibly a Canon bug or something.

    I'll look into it when I get a chance.

    Don

    I just took a glance at some of Andy's 20D photos, and the EXIF data embedded in the photo matches smugmug's EXIF display page exactly.

    Can you point me to some photos (which haven't been cropped!) which show a mismatch?

    It is entirely possible Canon is making a mistake, but it seems unlikely. If they are, there's nothing we can do about it.

    Don
  • miketaylor01miketaylor01 Registered Users Posts: 318 Major grins
    edited October 14, 2004
    Thanks for the quick response.. Just an option that I have seen on some users pages in PBase that I thought was a cool little reference. No big deal. I can see how providing everything would make the page cluttered.
    Mike

    Sigma SD9, SD14, and DP1
    http://miketaylor.giph.com
  • onethumbonethumb Administrators Posts: 1,269 Major grins
    edited October 22, 2004
    onethumb wrote:
    I just took a glance at some of Andy's 20D photos, and the EXIF data embedded in the photo matches smugmug's EXIF display page exactly.

    Can you point me to some photos (which haven't been cropped!) which show a mismatch?

    It is entirely possible Canon is making a mistake, but it seems unlikely. If they are, there's nothing we can do about it.

    Don

    BUMP!

    Can anyone point me to some photos which clearly are shown with the wrong EXIF data on smugmug? I'd like to get this fixed.

    Don
  • liyifanliyifan Registered Users Posts: 1 Beginner grinner
    edited October 24, 2005
    Don't know about 20D but 350D problem here
    http://li.smugmug.com/gallery/896927
    All pictures, cropped in smugmug or uncropped, show strange guess.
  • mercphotomercphoto Registered Users Posts: 4,550 Major grins
    edited October 24, 2005
    onethumb wrote:
    BUMP!

    Can anyone point me to some photos which clearly are shown with the wrong EXIF data on smugmug? I'd like to get this fixed.

    Not sure this can be called wrong EXIF data, but try: http://mercphoto.smugmug.com/gallery/851398

    Click on exif. Notice the focal length is 135mm (which is correct). Notice the guess is 105mm in 35mm terms, which is very wrong. Should be 216mm (true focal length times 1.6 crop factor). This has been what I have seen wrong most often, the "guess" focal length being very far off. You might want to consider not guessing at all.

    [EDIT] Looking back at my original post, I am not seeing an incorrect color space or an incorrect flash mode being reported on this particular image, though I know that was being reported wrong (at least on some images) in the past. This continues to be a low-priority issue for me. As I originally posted, I was bringing this up mostly because it was wrong, not because it was important. :)
    Bill Jurasz - Mercury Photography - Cedar Park, TX
    A former sports shooter
    Follow me at: https://www.flickr.com/photos/bjurasz/
    My Etsy store: https://www.etsy.com/shop/mercphoto?ref=hdr_shop_menu
  • wslamwslam Registered Users Posts: 277 Major grins
    edited March 23, 2006
    I don't understand why Smugmug would 'guess'.
    Focal length is focal length.
    For guessing, you are really just guessing the 35mm eq FOV of Focal Length. NOT the actual focal length.
    Besides, it's ALWAYS wrong (guessing). Why bother? I see this thread goes way back (2004). Time to get rid of the guess or fix it!
    ws, photos.lam.ws
  • AndyAndy Registered Users Posts: 50,016 Major grins
    edited March 23, 2006
    wslam wrote:
    I don't understand why Smugmug would 'guess'.
    Focal length is focal length.
    For guessing, you are really just guessing the 35mm eq FOV of Focal Length. NOT the actual focal length.
    Besides, it's ALWAYS wrong (guessing). Why bother? I see this thread goes way back (2004). Time to get rid of the guess or fix it!

    Thanks for the feedback, ws, we really appreciate it. You always have the absolute focal length in the exif. The guess, is attempting to approximate the FOV crop of the different cameras. It could be better, yes. BTW, try "critique style" you'll see that it's perfect mwink.gif
    Andy

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