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Thread: Focal Flange Distance

  1. #1
    Vallantho
    Join Date
    Apr 2013
    Location
    England
    Posts
    44

    Focal Flange Distance

    Hello there, just a quick question. Where is the focal flange distance measured from? Is it from the shutter or the lens board? Sorry I'm sure this question has been asked many times before. Thank you

  2. #2
    Tin Can's Avatar
    Join Date
    Dec 2011
    Posts
    13,229

    Re: Focal Flange Distance

    I just did this. I measured from the actual flange rear to the GG front when focused on infinity

    MY NOS mystery barrel lens is marked 360 mm and the flange back was exactly that on 4X5 Horseman Optical Bench camera

    I was surprised it was exact...

    https://briansmith.com/flange-focal-distance-guide/
    sin eater

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