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Thread: Betax #5 Threads

  1. #1
    Al in NC
    Join Date
    Feb 2012

    Betax #5 Threads

    I'm planning to mate a Petzval to a Betax #5 shutter, for which I need to machine an adapter ring. The Petz has a flange, so no problem affixing it to the adapter, but the Betax has female threads, somewhere in the vicinity of 2.93 inches in diameter. Does anyone know the thread specs for a #5 Betax--diameter and threads per inch (English or metric)?

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

    Re: Betax #5 Threads

    listed as 2 29/32"

    my black and white photos of the Mendocino Coast:

  3. #3
    Al in NC
    Join Date
    Feb 2012

    Re: Betax #5 Threads

    Thanks. Sounds about right.

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