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Thread: What hole for a Betax no 3 shutter?

  1. #1

    What hole for a Betax no 3 shutter?

    Hi, I've recently acquired an old Wollensack lens mounted on a Betax no 3 shutter. I need a lensboard for it to use on my Sinar Norma, what hole diameter would I need on a lens board? Most ebay listing seems to have holes for standard Copal shutter sizes, is there any one Copal size which is close enough and might work for a Betax no 3?

    many thanks

  2. #2
    Jon Shiu's Avatar
    Join Date
    Nov 2003
    Mendocino, California

    Re: What hole for a Betax no 3 shutter?

    The Betax is mounted on a flange, which is mounted to the front of the lens board. So the flange lip would have to fit through the hole. As I remember it is slightly more than 52mm. That's not close to Copal sizes (42mm, 65mm).
    my black and white photos of the Mendocino Coast:

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