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Thread: Bellows Extension Required

  1. #1

    Join Date
    Dec 2008
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    Near Portland Oregon
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    54

    Bellows Extension Required

    If I were focusing on a flower 2" in diameter with a 180mm macro lens at 2:1 how much bellows extension would I need? How do you arrive at the answer?

  2. #2

    Join Date
    Dec 2001
    Location
    NJ
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    4,918

    Re: Bellows Extension Required

    There are books on this and the topic is discussed on many web sites. Buy a copy of Lester Lefkowitz' book The Manual of Closeup Photography to learn how to think about close up (up to 1:1) and photomacrography (above 1:1).

    Short answer, the distance from film plane to lens' rear node given magnification and focal length is focal length * (1 + magnification). 2:1, 180 mm => 180 * 3 = 540 mm.

    For lenses of normal construction (that's your 180 macro lens) the rear node is close to the diaphragm.

  3. #3

    Join Date
    Dec 2008
    Location
    Near Portland Oregon
    Posts
    54

    Re: Bellows Extension Required

    Thanks!

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