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Thread: bellows factor app

  1. #21
    mamanton's Avatar
    Join Date
    Jun 2011
    Saint-Petersburg, Russia

    Re: bellows factor app

    Hi everybody! We have an app. Totally free!

  2. #22

    Re: bellows factor app

    Free App for Bellows Extension (Factor) - Art of Foto

    Apple -

    Google -

  3. #23
    Mark Sawyer's Avatar
    Join Date
    Jul 2004
    Stuck inside of Tucson with the Neverland Blues again...

    Re: bellows factor app

    Okay, one more time...


    "f" is the "focal length".

    "/" is over, as in "divided by".

    "stop" is the diameter of the aperture that stops light.

    "f over stop" = Focal length divided by the diameter of the stop.

    It's a fraction. That's it. A fraction.

    One number over another number. A fraction. A freakin' fraction.

    If you need an app to explain basic third grade math for you, you're already in over your head. You won't really understand what the answer means anyways...


    (Yeah, I'm being grumpy again... )
    "I love my Verito lens, but I always have to sharpen everything in Photoshop..."

  4. #24

    Join Date
    May 2013
    Denver metro.

    Re: bellows factor app

    5/3 of Americans don't understand fractions.


  5. #25
    Tin Can's Avatar
    Join Date
    Dec 2011

    Re: bellows factor app

    Got the app to back up my sewing tape measure.

    Thanks Ken and mamanton!

    I can do freactions now, but soon or later maybe not...

  6. #26
    Drew Bedo's Avatar
    Join Date
    Oct 2006
    Houston Texas

    Re: bellows factor app

    Um. . .yeah. Just pre-figure the per-inch correction for your most used lenses or the metric equivilant. Do the math once.

    When shooting in the field with the creative juices flowing and the wind blowing, you can get it done on the fly and leave the smart phone safely stowed away.

    When shooting something critical (as in bridal portraits for money)I n the studio, go ahead and work it out to the 1/10 of a stop (sorry about using a fraction).
    Drew Bedo

    There are only three types of mounting flanges; too big, too small and wrong thread!

  7. #27

    Join Date
    Apr 2017

    Re: bellows factor app

    All discussion over best method/personal preference/whether or not an app should be needed aside.....the the app Photo Buddy has a bellows extension calculator in it. I believe it is free but could be wrong. I have had the app on iPhone for a long time, and use it mostly for its other features, but it is there. Download it and try it if you like.

  8. #28

    Join Date
    Nov 2008
    Atlanta, GA

    Re: bellows factor app

    Just use f-stop inches. For an 8 inch lens (“f8”) open 1 stop at 11” (“f11”) and 2 stops at 16” (“f16”). Substitute f-stop cm as needed.

  9. #29

    Join Date
    Dec 2014
    Iowa City, Iowa

    Re: bellows factor app

    I carry a nice compact 8' tape measure and the little Kodak guides with all the little dial computers.

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