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    Working out Minimum Focusing Distance

    The extension past infinity focus, e, is the max extension minus the flange-focal distance. Here e = 570 - 428 mm = 142mm.

    The image distance from the lens, i, is about the focal length, f plus...
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    Copal shutter f markings

    Generally the lens manufacturer supplies a plate which is calibrated to show the right f-stops for the lens - since any number of different lenses can come in a copal 1 shutter. Your lens may have...
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    Film holder depth for 8 X 10

    Ooops!!! Another question from Chris prompted me to realize that I made a dumb mistake. The 0.197" depth is for 4x5 holders, and doesn't apply to 8x10 holders. I don't know the ISO standard for...
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    Film holder depth for 8 X 10

    The standard film holder depth is 0.197 inches and film is assumed to be 0.007 inches thick, so the surface of the film is 0.190 inches (4.83mm) back from the face of the film holder. This is very...
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