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Thread: What does Lens Fstops (in EXIF data) represent?

  1. #1
    New Member kriegsketten's Avatar
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    Default What does Lens Fstops (in EXIF data) represent?

    I get this from the EXIF data from Flickr:

    http://www.flickr.com/photos/5019148...in/photostream

    For the above image, I've set the f-stop to f/29, scroll further down the data stream, you get an item called Lens Fstop: 7.00

    What does that signify? Additional stops down from the f/29? FYI, I'm using a Nikon Micro 60mm f2.8...

    Even when I set at f/36, it is still at 7.00... Please enlighten me what the Lens Fstop means?

    at f/36:
    http://www.flickr.com/photos/5019148...in/photostream

  2. #2

    Default Re: What does Lens Fstops (in EXIF data) represent?

    7 stops from your lens max. simple answer.

    f/29 and f/36 are awfully close, so the exif may register it simply as a 7 stop spread.

  3. #3
    New Member kriegsketten's Avatar
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    Default Re: What does Lens Fstops (in EXIF data) represent?

    Thanks very much!

    Now I understand. Still getting used to the lens...

    Come to think of it. I believe I've set f/22 and f/32 initially, the cam set it f/29 and f/36 by itself respectively, not me. It kinda threw me off... And I've over read the "7.00" stops completely... now I've realised there are exactly 7 stops from the f/28 (as you've said)... Everything is clear now. Thanks! (I'm not a number person...)

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    Senior Member wildcat's Avatar
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    Default Re: What does Lens Fstops (in EXIF data) represent?

    Quote Originally Posted by Dream Merchant View Post
    7 stops from your lens max. simple answer.

    f/29 and f/36 are awfully close, so the exif may register it simply as a 7 stop spread.
    Good info to know. I didn't know this also

  5. #5
    Senior Member ZerocoolAstra's Avatar
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    Default Re: What does Lens Fstops (in EXIF data) represent?

    Quote Originally Posted by kriegsketten View Post
    Thanks very much!

    Now I understand. Still getting used to the lens...

    Come to think of it. I believe I've set f/22 and f/32 initially, the cam set it f/29 and f/36 by itself respectively, not me. It kinda threw me off... And I've over read the "7.00" stops completely... now I've realised there are exactly 7 stops from the f/28 (as you've said)... Everything is clear now. Thanks! (I'm not a number person...)
    hahaha i didn't even know about this value.
    It goes to show: You worry too much. Don't sweat the small stuff! Go out and take beautiful images!
    Exploring! :)

  6. #6

    Default Re: What does Lens Fstops (in EXIF data) represent?

    Most lenses will 'loose' light when extended or focused closer like macro lenses or lenses put on extension tubes or macro bellows.

    That's why your f/2.8 lens becomes a f/3.1 lens wide open when you went closer.

    The camera isn't 'changing' anything. It's just recording what your real-life actual 'aperture value' is after the 'light loss', regardless of what value you dial in on the camera.

    Don't worry about it (all that data in the EXIF) and enjoy using the lens.

    I'm guessing there's a lot of data there that won't be relevant to anyone except someone doing diagnostics or analysis.

    CHEERS!
    Last edited by Dream Merchant; 17th May 2010 at 12:06 AM.

  7. #7
    New Member kriegsketten's Avatar
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    Default Re: What does Lens Fstops (in EXIF data) represent?

    Well, I'm still learning, so it is only natural that I get curious with all those data in EXIF...

    I'm not sweating over it, don't worry...

    Oh, I can't wait to go out and have fun with it!

    Thanks for the detailed explanation, Dream Mechant. It really helps with "gurus" like you around us... The pillars of CS!

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