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  1. #11

    Join Date
    Jul 2007
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    Netherlands
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    Quote Originally Posted by Ian C View Post
    All this is given with the usual caveat about applying to lenses of approximately symmetrical design.

    We decide whether to use the standard formulas or to consider pupillary magnification based on the lens angle.
    We don't have to.
    Asymmetry and pupillary magnification are not relevant here.

  2. #12
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
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    35mm
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    2,749
    even if you do not know the exact calculations
    you could remove the back of your box camera and put a piece of
    parchment paper, velum, wax paper inside and see where things focus.
    My camera actually has a ground glass. My problem was that to adjust the "bellows extension", I was going to have to cut some material off. So I wanted to know beforehand how much to take off. I ended up using my dremel to route 1-2 ish milimeters off. Even though I have a ground glass, it's still very hard to see exact focal distance at f/6.8 on a 90mm lens. I shot some tests shots and will enlarge them to 8x10 or so to determine where my focus point ended up.
    f/22 and be there.

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