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Thread: are intermediate shutter speeds possible with copal shutters

  1. #1

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    are intermediate shutter speeds possible with copal shutters

    Just wondering...are intermediate shutter speeds available with copal, Ilex or compur shutters?

    Thanks in adavnce,

    Serge

  2. #2

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    Re: are intermediate shutter speeds possible with copal shutters

    Intermediate shutter speeds are only available with electronic shutters. Digital cameras often allow intermediate shutter speeds, but lenses with mechanical shutters don't.

  3. #3

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    Re: are intermediate shutter speeds possible with copal shutters

    No, but it is a good way to break a mechanical shutter.

  4. #4

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    Re: are intermediate shutter speeds possible with copal shutters

    Thanks. Good to know

  5. #5
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: are intermediate shutter speeds possible with copal shutters

    Rim-set mechanical shutters use a cam plate to move a lever from one position (speed) to another.

    Each step on the cam plate is flat (radially) over some distance each side of its detented position.

    The transition between steps is quite narrow, having a slope only sufficient to move the lever without binding.

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  6. #6

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    Re: are intermediate shutter speeds possible with copal shutters

    There have been shutters with a continuous timing device - many pneumatic ones, for example, and some odd low end mechanical ones as well. But as far as recent LF ready shutters with standardized size and a wide range of times go, these are all stepped.

  7. #7

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    Re: are intermediate shutter speeds possible with copal shutters

    Quote Originally Posted by Leonard Evens View Post
    Intermediate shutter speeds are only available with electronic shutters. Digital cameras often allow intermediate shutter speeds, but lenses with mechanical shutters don't.
    Compound shutters do allow intermediate speeds. So do the Leicaflexes, and a few other mechanical shutters.
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  8. #8
    Deardorff Sales and service
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    Re: are intermediate shutter speeds possible with copal shutters

    On Ilex shutters the speed ring is a continuous cam. So yes. Compound the same and old dialset compurs yes. But you need to test the spot and mark it. Dial Compurs have a machined cam that you can not modify. same with a copal.
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  9. #9
    loujon
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    Re: are intermediate shutter speeds possible with copal shutters

    Quote Originally Posted by E. von Hoegh View Post
    Compound shutters do allow intermediate speeds. So do the Leicaflexes, and a few other mechanical shutters.
    The Betax/Alphax allows intermediate speeds as well. albeit the high speed is limited to 35th a second tops

  10. #10
    Whatever David A. Goldfarb's Avatar
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    Re: are intermediate shutter speeds possible with copal shutters

    For shutters that can do it, you would have to test fairly carefully right before making the exposure, and then it wouldn't usually apply to the top or the bottom speeds. After all, how accurate is your average ancient Ilex/Alphax/Betax shutter anyway on a good day? I wouldn't count on better than +/- 1/3 stop on the marked settings to begin with. Well-maintained dial-set Compound shutters, though, might be a bit more reliable than one would expect.

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