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Thread: New article: guillotine shutters

  1. #61

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    Re: New article: guillotine shutters

    It seems the idea of a simple shutter got lost along the way, though I did appreciate the ingenuity.

    As for the matter of being committed to horizontal exposures as mentioned on page 1, simply calibrate for a vertical exposure, and when you rotate the back subtract 1/4 for a 4:5 proportion, or 1/3 for a 2:3. If you have to rotate the camera, same calculations, just mount the shutter to allow rotating it 90 degrees.

  2. #62

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    Re: New article: guillotine shutters

    I really should have taken the time to compliment Bill Kumpf on the article. I use my oscilloscope to calibrate as well. The entire article was thorough and very professional. I hope to post soon on a simple rotating shutter design.

    If you believe you can you do it, you can!

  3. #63
    Jim Jones's Avatar
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    Re: New article: guillotine shutters

    Quote Originally Posted by chaspics View Post
    . . . I hope to post soon on a simple rotating shutter design.

    If you believe you can you do it, you can!
    The Guillotine shutter is simple, fairly compact, and reliable when properly constructed. A simple rotary shutter may be bulky and more prone to vibration, but can be extremely consistent and accurate. A good example is the 35mm Mercury and Mercury II cameras made between the late 1930s and about 1950. Seventy-five years ago Harvard University tested several shutters for use in a solar coronagraph. The Mercury shutter was chosen for its accuracy and reliability over Leica, Contax, and Argus. The Mercury had an error of 5% at 1/1000 second. The others gave exhibited errors of about 50% at their top speeds. The Mercury shutter was still performing accurately after 112,000 cycles in intense heat and sub-zero temperatures.

  4. #64

    Re: New article: guillotine shutters

    in need a very sinple design that operates with just a push, can be spring loaded but i need a shutter that opens and closes quickly (or a design so I can make it myself). The iris shutter on a camera is too complicated for my project but it would be ideal if i could get a simpler version. I just want to know some resources/suppliers names or alternative ideas to the camera shutter. Thanks for any help.

  5. #65
    Jac@stafford.net's Avatar
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    New article: guillotine shutters

    http://www.earlyphotography.co.uk/site/shuttern.html

    Hope that is not too complicated.

  6. #66

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    Jul 2017
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    Re: New article: guillotine shutters

    nice work .... could you do the calculation if we consider a SLOT , with variable width, somehow like the focal shutter found in SLR ... ??
    Thanks !!!

  7. #67

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    Jul 2017
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    Re: New article: guillotine shutters

    thanks .... very instructive ..................

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