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Thread: Another shim question

  1. #1

    Another shim question

    Hello Sinar lovers

    I have one Apo Sironar-S 210 on a Sinar DB board and a Nikkor-W 210 in a copal 1 shutter. I'd like to have it the other way around.
    The Sironar has a shim and I'm not sure how to think around this. Is the shim for correcting the element group spacing in that particular mount, or are the mount (db/copal) tolerances tight enough so that I can switch the lens+shim between the mounts without noticing a difference?

    Ofc I could burn through a box of film to test this, but I'd rather not. I also want to know the basic theory behind this.

    I hope my question makes sense.
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  2. #2

    Join Date
    Aug 2018
    Posts
    350

    Re: Another shim question

    Did you compare the corners when raised equally amount?
    I sold the Symmar-S to keep the 210mm Nikkor-W with 77mm filter threads as the Symmar-S was really ugly on the border of coverage.

    Sent fra min SM-G975F via Tapatalk

  3. #3

    Re: Another shim question

    I have not. I shoot 4x5 and the border of coverage is at around 10cm shift on the Sironar, where the angle against the ground glass makes it very hard to judge anything.
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