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Thread: New article: guillotine shutters

  1. #11
    joseph
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    Re: New article: guillotine shutters

    That shouldn't be a problem, you can build the long term bend into the tolerance of the slot-
    or in the short term, unbend it just before the exposure.

    My darkslides are quite straight when I remove them from my holders-
    certainly straight enough for a shutter-

    Of course, other materials could be better- copper sheathed printed circuit board should be dimensionally stable enough.

    It's obvious this is a workable thing, it's not a new thing-

  2. #12

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    Re: New article: guillotine shutters

    Quote Originally Posted by jb7 View Post
    ...

    It's obvious this is a workable thing, it's not a new thing-
    Indeed, it is not. It always amazes me how long it takes for somebody to realize what constructors of these gravity guillotine shutters did in the 19th century quite easily - and the manufactures of the same left in the bin of the photographic history soon afterwards.
    GPS

  3. #13

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    Re: New article: guillotine shutters

    Quote Originally Posted by GPS View Post
    And if you wanted to make a De luxe version you could put a small drop of oil between the blades to make it slip with less friction even in more inclined positions. Olive oil (extra virgin) would do...;-)
    Delrin yes - olive oil no

  4. #14

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    Re: New article: guillotine shutters

    Quote Originally Posted by Lee Hamiel View Post
    Delrin yes - olive oil no
    Red herrings yes - Red Socks no.
    GPS

  5. #15

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    Re: New article: guillotine shutters

    k yes, g no

  6. #16
    joseph
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    Re: New article: guillotine shutters

    Quote Originally Posted by GPS View Post
    Indeed, it is not. It always amazes me how long it takes for somebody to realize what constructors of these gravity guillotine shutters did in the 19th century quite easily - and the manufactures of the same left in the bin of the photographic history soon afterwards.
    That's a pretty condescending tone you've got there.
    Good thing I've discovered the ignore list, I might be using it shortly-

    Thanks for the history lesson GPS.

    Putting this Victorian invention in a historical context -
    films got better, cameras and lenses got smaller.
    Guillotine shutters, along with large lenses, got consigned to the bin of history, because mechanical shutters became possible due to smaller optics.

    Cut to the 21st century, and again, people want to make exposures with some of those large lenses.

    Problem: modern shutters don't fit large lenses.
    Problem: Focal Plane shutters not suitable for every camera.
    Problem: Packard shutters limited to single speed, larger shutters limited to slower speeds due to physical acceleration/deceleration limits of large blades.


    One solution (of many): guillotine shutter.


    You see, some people search for solutions to problems, others prefer to tell them how it can't be done, and it's not worth bothering even to try-
    and it does get trying, over threads too numerous to mention-

  7. #17

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    Re: New article: guillotine shutters

    To vary exposure duration, would making interchangable blades with different size slits work?
    Real cameras are measured in inches...
    Not pixels.

    www.photocollective.org

  8. #18

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    Re: New article: guillotine shutters

    Quote Originally Posted by jb7 View Post
    ...

    You see, some people search for solutions to problems, others prefer to tell them how it can't be done, and it's not worth bothering even to try-
    ...-
    Now, when you're at it - say, who said it can't be done?? Maybe you're just talking nonsense here.
    GPS

  9. #19

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    Re: New article: guillotine shutters

    Yep, note reference to slot width in the calculation of shutter speed article.

    Quote Originally Posted by dsphotog View Post
    To vary exposure duration, would making interchangable blades with different size slits work?

  10. #20
    jp's Avatar
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    Re: New article: guillotine shutters

    I was pleasantly surprised at how consistent the testing revealed the shutter to be. That's excellent. However, I suspect as soon as your rubber band rotted out in a couple months, you'd replace it and have to retest your speeds because of the variety in rubber bands. If there were some sort of synthetic rubber bands or some other sort of crude yet consistent source of spring, that would appeal to me.

    The webpage is very thorough and detailed and brought back memories of doing lab reports in high school and college!

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