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Thread: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and Fast

  1. #21
    Randy's Avatar
    Join Date
    Dec 2010
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    Virginia, USA
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    1,296

    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Just stop down to f/64.
    https://dl.dropboxusercontent.com/u/52893762/bigger4b.jpg

  2. #22
    Eric Woodbury
    Join Date
    Dec 2003
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    1,360

    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Randy, why stop there? Pinhole and no worries.

  3. #23

    Join Date
    Dec 2006
    Location
    Hamilton, Canada
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    1,622

    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    The good news for portraits is that something is going to be in focus.
    Bill
    "There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).

  4. #24

    Join Date
    May 2015
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    SooooCal/LA USA
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Quote Originally Posted by cowanw View Post
    The good news for portraits is that something is going to be in focus.


    An ear... ;-)

    Steve K

  5. #25

    Join Date
    Apr 2011
    Location
    Hemel Hempstead, UK
    Posts
    526

    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Found this timely; I've just done similar but with a surface flat, offset depth gauge, and a distance piece. As shown in the OPs image, you're trying to measure the depth from the seating plane to the glass, and from the seating plane to the film. Given that there can be all sorts of lumpy bits on the back of the glass holder, it can be tricky to mount; I like the Jim's quick and easy gauge.

    My MPP was designed to take glass plates, not the modern film holder, and while it's fine with a home-made film carrier plate in a glass plate holder, it isn't quite right for a film holder. Standards change, with time.

    (Another way to measure it is to use a steel rule instead of the spirit level; rock it across its width to find the deep point).

    Neil

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