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Thread: How and why to use close-up lenses on large format cameras

  1. #31

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    Re: How and why to use close-up lenses on large format cameras

    Quote Originally Posted by Drew Wiley View Post
    Some enlarger lenses work well. Although they're rare, Schneider once offered Componons in shutter for close-range use, even though they're normally associated with enlarging.
    I have some of these beastlets (75 mm in #00, 105 mm in #0) and equivalents from D.O.I. (105 mm in #0). All came from mug shot cameras. I bought 'em for the shutters. One was even in a cock and shoot #0. Who'd a thunk it?

  2. #32
    Maris Rusis's Avatar
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    May 2006
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    Re: How and why to use close-up lenses on large format cameras

    Quote Originally Posted by xkaes View Post
    Wouldn't it be nice to have a formula to know, at least approximately, how much a given diopter would reduce the image circle, such as NEW IC = OLD IC / (DIOPTER X ?).
    Try this formula: (New focal length/Old focal length) X Old image circle = New image circle. Do check the mathematics to see if the approximation is good enough for you. What would suggest for a more exact calculation?

    "New focal length" in the above formula is the result of adding a supplementary lens (positive or negative dioptre) to the original "Old focal length " lens.
    Photography:first utterance. Sir John Herschel, 14 March 1839 at the Royal Society. "...Photography or the application of the Chemical rays of light to the purpose of pictorial representation,..".

  3. #33

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    Re: How and why to use close-up lenses on large format cameras

    Too late to edit. Mental lapse. My beastlets (see post # 31 above) are Comparons, not Componons. Oops!

  4. #34

    Re: How and why to use close-up lenses on large format cameras

    Quote Originally Posted by xkaes View Post
    There's an important update to:


    Check it out!
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