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Thread: Nikon AM 120 macro lens

  1. #1

    Join Date
    Jun 2007
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    67

    Nikon AM 120 macro lens

    what bellows dram would one need using a nikon 120mm AM macro lens with 4x5 film to get 2:1 macro?

  2. #2

    Join Date
    May 2009
    Location
    Vermont
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    184

    Re: Nikon AM 120 macro lens

    I believe 480mm would be 2:1, used to know this stuff.

    Tom

  3. #3

    Join Date
    Dec 2001
    Location
    NJ
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    7,751

    Re: Nikon AM 120 macro lens

    The magic formula is: rear node to film distance = focal length * (magnification + 1).

    The lens rear node is approximately at the diaphragm, so is a few mm in front of the board. Extension will be approximately 120 * (2 + 1) = 360 mm.

  4. #4

    Join Date
    May 2006
    Location
    Westminster, MD
    Posts
    1,654

    Re: Nikon AM 120 macro lens

    Damn if I own the lens but have never used it at 2:1 to know this detail. I do know to always measure from the nodal point, but all those formula learned in class decades ago have faded away. Grin. Good luck.
    When I grow up, I want to be a photographer.

    http://www.walterpcalahan.com/Photography/index.html

  5. #5

    Join Date
    Jun 2007
    Posts
    67

    Re: Nikon AM 120 macro lens

    Thanks

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