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Thread: Adapter / ring? Rodenstock Sironar-N 210mm

  1. #1

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    Aug 2019
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    Adapter / ring? Rodenstock Sironar-N 210mm

    Just bought a Rodenstock Sironar 210mm with Prontor Press shutter on ebay.
    What is this adapter / ring for? Never seen this before. Is it for mounting the lens on the lens board a bit further away or?
    Attached Thumbnails Attached Thumbnails IMG_6858.jpg   IMG_6859.jpg  

  2. #2

    Join Date
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    Nara, Japan
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    Re: Adapter / ring? Rodenstock Sironar-N 210mm

    That's a spacer ring. They're usually found on #3 lenses. It's nice to have if you're using the lens on a field camera, where the uprights on the lens panel might prevent the lens from being mounted, or the controls are obstructed.

    Kumar

  3. #3

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    Mar 2005
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    Newbury, Vermont
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    883

    Re: Adapter / ring? Rodenstock Sironar-N 210mm

    ...test and/or measure to be sure that the spacing between front and rear cells is as "factory specified."

  4. #4

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    Aug 2019
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    Re: Adapter / ring? Rodenstock Sironar-N 210mm

    Quote Originally Posted by B.S.Kumar View Post
    That's a spacer ring. They're usually found on #3 lenses. It's nice to have if you're using the lens on a field camera, where the uprights on the lens panel might prevent the lens from being mounted, or the controls are obstructed.

    Kumar
    Thank you very much for the info. as you say can be good to have.

  5. #5

    Join Date
    Aug 2019
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    Re: Adapter / ring? Rodenstock Sironar-N 210mm

    Quote Originally Posted by John Layton View Post
    ...test and/or measure to be sure that the spacing between front and rear cells is as "factory specified."
    Where can I find the correct values for "factory specified" so I know if it's correct?
    Or how is it possible to test?

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