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  1. #1

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    Thread size & pitch of pre-war Bessa 6x9 RF (w/ Skopar)

    Hi all,

    What is the exact size (and pitch) of the threads in front of the Skopar lens of pre-war Bessa 6x9 RF?

    TIA,
    Loris.

  2. #2

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    If nobody has a correct answer you may have to use a thread pitch gauge to find out. (Maybe borrow from a machine shop..)
    These inside threads can be tricky to measure.
    (I once machined with trial-and-error method a metal lens hood to my Mamiya-Sekor (1959) with a lathe and had to make a tool for it. If my memory serves me right this M40.5 thread had a pitch of 0.75mm and had an angle of 50 degrees.)
    Have a look at these: http://www.gewinde-normen.de/en/camera-mount.html

    I found it! Mr Butkus's manual says "37mm"
    Have a go: http://www.butkus.org/chinon/voigtla...df_manuals.htm
    Attached Thumbnails Attached Thumbnails pitchgage-2head-metric.jpg  
    Last edited by Jojje; 12-15-2010 at 09:35 AM. Click to view previous post history. Reason: new information

  3. #3
    edp
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    37mm push-on, not screw-on.

  4. #4

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    I knew it. Sounded too easy...

  5. #5

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    Thanks all, I'm aware about the 37mm push-on. I noticed there are threads in the inner side of the filter ring, I was planning to use a step-up ring (there are shops producing step-up rings for odd sized filter threads) to a more usual filter size (39mm for instance) and use accessories (a lens hood - most importantly!) designed for it.



 

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