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Thread: Copal 3 shutter & 300mm lens on Calumet lens board

  1. #1

    Join Date
    Jun 2015
    Location
    Anglesey, North Wales, UK [53.3N 4.4W]
    Posts
    465

    Copal 3 shutter & 300mm lens on Calumet lens board

    On EBay there is an offer for a f4.5, 300mm lens in a Copal 3 shutter.
    The outside diameter of the shutter is 100mm
    The lens board on my Calumet CC401 is 100 x 100mm
    Obviously the shutter cannot be connected directly to the lens board
    BUT could a spacer be placed between the front of the lens board and the back of the shutter?
    If what, if any, would be the functional disadvantages/problems?

    regards

    Tony

  2. #2

    Join Date
    Sep 1998
    Location
    Oregon now (formerly Austria)
    Posts
    2,578

    Re: Copal 3 shutter & 300mm lens on Calumet lens board

    Tony,

    I'll bet you can use it just by mounting on the board. Usually there's enough leeway that the shutter body clears the small obstacles like the lensboard clamps, etc.

    If not, a spacer is the way to go; often just a shim of gasket material between shutter and board of the appropriate thickness to get the shutter to clear whatever is in the way. Masonite or the like will work if you need thicker. There should be plenty of threads on the shutter barrel to do this. Certainly, spacing out a lens from the lensboard will have no effect whatsoever on its optical performance.

    If worse comes to worse, you can use an extended lensboard to get the shutter placed even more forward of the front standard (this will give you a bit more bellows draw as well).

    Best,

    Doremus

  3. #3

    Join Date
    Feb 2012
    Location
    South Texas
    Posts
    1,833

    Re: Copal 3 shutter & 300mm lens on Calumet lens board

    Yes, just mount the shutter to the board. I'll be fine with that camera.

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