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Thread: Rodenstock Geronar 210mm 6.8 rear flange diameter

  1. #1

    Join Date
    Mar 2005
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    66

    Rodenstock Geronar 210mm 6.8 rear flange diameter

    Hi Looking for the diameter of the rear lens flange. Can someone tell me/measure? I am building a 6x9cm camera and need a portrait lens that fits in a homemade helical.
    Thanks
    Darcy

  2. #2

    Join Date
    Mar 2005
    Location
    Aurora, Colorado
    Posts
    526

    Re: Rodenstock Geronar 210mm 6.8 rear flange diameter

    I have a Caltar II-E 210/6.8 (Calumet re-branded Geronar) in a Copal 1 shutter. I'd be happy to measure it for you but I'm not sure what measurement you're looking for. Can you clarify?
    Never is always wrong; always is never right.

    www.LostManPhoto.com
    www.MarkStahlkePhotography.com

  3. #3

    Join Date
    Jan 2006
    Location
    Ohio
    Posts
    94

    Re: Rodenstock Geronar 210mm 6.8 rear flange diameter

    I also have the Caltar version in a Copal 1, the lens board hole size would be approximately 42mm.

  4. #4

    Join Date
    Sep 1998
    Location
    Loganville , GA
    Posts
    14,409

    Re: Rodenstock Geronar 210mm 6.8 rear flange diameter

    The 210mm Geronar is in a Copal 1 shutter. The mounting thread for a Copal 1 shutter is 39 x 0.75mm. The brand or model of the lens is not a factor in the mounting. What is a factor is the flange focal length of the lens and the focal length of the lens which together determines the thickness and throw of the helical and the distance betwwen the film plane and the collapsed helical for infinity focus. The 210mm Geronar in Copal 1 had a flange focal length of 195.3mm at infinity.

  5. #5

    Join Date
    Mar 2005
    Posts
    66

    Re: Rodenstock Geronar 210mm 6.8 rear flange diameter

    Thanks for your replies. They all help. Darcy

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