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Thread: Simple Lens Cap/Shutter for 6" Metrogon

  1. #1

    Join Date
    Dec 2018
    Posts
    138

    Simple Lens Cap/Shutter for 6" Metrogon

    I had an "Aha!" moment today...
    I was messing around with my Metrogon project, and wondering how to avoid spending money on putting it in a shutter...when I looked over and saw a scrap piece of black plastic from TAP Plastics.
    A few minutes with a Dremel, etc. And I came up with this:
    Click image for larger version. 

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    I now plan on making a small aperture out of black paper for long exposures.....and then to test.
    Stay tuned.

  2. #2
    (Shrek)
    Join Date
    Mar 2011
    Location
    Montreal
    Posts
    1,666

    Re: Simple Lens Cap/Shutter for 6" Metrogon

    Does yours not have an internal diaphragm? If I recall mine is set by turning a little brass gear, and I had to open it and chisel out a stop protruding from the casting to get it to open fully.

  3. #3

    Join Date
    Dec 2018
    Posts
    138

    Re: Simple Lens Cap/Shutter for 6" Metrogon

    I have two that are complete with airplane shutters, and a mixed collection of elements, parts & center filters to experiment with.
    I will probably donate the complete units to air museums at some point, once I find a parts setup for my LF photography that does what I want it to do.
    I got the complete ones in order to determine spacing between front and rear groups.
    The pics I attached are just for proof-of-concept.
    I plan on making waterhouse stops out of thin black cardstock, or whatever, to find an aperture size that gives IQ I like.
    I haven't tried to modify the shutter units...both have adjustable diaphragm, one has a "choke" to reduce max. aperture.
    Last edited by Dugan; 23-Mar-2020 at 14:06. Reason: More info.

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