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Thread: accurate long exposure control with tech

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    Workshop Member Wayne Fox's Avatar
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    accurate long exposure control with tech

    Anyone using some type of timer/controller to the cable release of a tech so exposures over 1 second are consistent?
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    Member Nutcracker's Avatar
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    Re: accurate long exposure control with tech

    Alpa FPS = easy (!) choice

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    Workshop Member Wayne Fox's Avatar
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    Re: accurate long exposure control with tech

    The arca tilt is more useful than the shutter on the alpa.
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    Re: accurate long exposure control with tech

    Quote Originally Posted by Wayne Fox View Post
    Anyone using some type of timer/controller to the cable release of a tech so exposures over 1 second are consistent?
    I was going to ask the same thing a while back. I have learned to time it pretty good by looking at the shutter time counter on the back. Would love an integrated electronic shutter on the lenses that do not require a large controller or usb connection.

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    Re: accurate long exposure control with tech

    How about the new electronic shutter about to be released by Rollei?

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    Re: accurate long exposure control with tech

    Hi Wayne -

    Just wondering how accurate the consistency you're looking for?

    For shutter times of a second and over, it's relatively simple to get them accurate to within a tenth of a second simply by using a stopwatch (one on a phone is good enough). Just start the stopwatch with one hand and fire the shutter with the other at the same time, then close the shutter when the watch gets to the time you want. With a little practice, I guarantee you can get to at least 0.1 second accuracy, if not a lot better.

    Obviously the longer the exposure, the more accurate - with regards exposure - your time becomes, but even at 2 seconds, if you're out by 0.1 seconds then that's only 0.07 of a stop. I'm not exactly sure how reliable and accurate Copal shutters are, but that could well be more accurate than regular shutter speeds and possibly even the aperture setting.

    Kind regards,

    Gerald.

    /edit

    Found some data for Copal shutter accuracy here (scroll to the bottom)

    http://www.largeformatphotography.info/shutters.html

    At 1/60th of a second, the test timings ranged from 0.01520 to 0.01455, which is about a 5% difference - roughly the same that 0.1 second accuracy at 2 seconds would be. Based on this I reckon you should be absolutely fine just timing your exposures manually with a stopwatch.
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    Subscriber & Workshop Member GrahamWelland's Avatar
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    Re: accurate long exposure control with tech

    +1 to Gerald's approach. I use the chrono on my watch or if it's short enough the timer on the IQ back display. I'm pretty sure that my reaction times are about as good as any shutter would be, even if it shot long enough.
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    Senior Member danlindberg's Avatar
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    Re: accurate long exposure control with tech

    +1
    Like Gerald & Graham I do the same and find it accurate enough.
    Alpa FPS • MAX • TC | Alpagon 32Hr | Helvetar 75 | Schneider 120N | Leaf Aptus II 5 • Leaf Credo 60 | www.danlindberg.com

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    Subscriber Member jotloob's Avatar
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    Re: accurate long exposure control with tech

    Quote Originally Posted by danlindberg View Post
    +1
    Like Gerald & Graham I do the same and find it accurate enough.

    Like Gerald & Graham & Dan do , I do the same.

    When I was still shooting LF I used the Prontor Professional Timer .
    It works perfectly good .
    Not that it is more accurate than your watch , but many times bypassing people tried to involve me into a chat and than I forgot my counting .

    There is also a smaller Prontor Timer , but I do not know , where I have hidden that smart little thing .

    Attachment 81138
    Regards . Jürgen .
    -----------------------------------------------------------------------------------

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    Re: accurate long exposure control with tech

    I use either the timer on the back of the IQ (make sure display is active for the entire exposure) or as an homage to Ansel, a metronome app on my iPhone. It clicks each second and I just count. Don't have to worry about starting it and the exposure at the same time.
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    Re: accurate long exposure control with tech

    Problem is on using the phase LCD as about 1/2 of the time the screen stays blank. I used to think it was because I has let the screen time out but the other day I was doing some 6 sec exposures and 1/2 of the time the screen timer did not come on.

    I too use watch stopwatch.

    Paul

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    Re: accurate long exposure control with tech

    Quote Originally Posted by jotloob View Post
    Like Gerald & Graham & Dan do , I do the same.

    When I was still shooting LF I used the Prontor Professional Timer .
    It works perfectly good .
    Not that it is more accurate than your watch , but many times bypassing people tried to involve me into a chat and than I forgot my counting .

    There is also a smaller Prontor Timer , but I do not know , where I have hidden that smart little thing .

    Attachment 81138
    That should do the trick. Very very cool.

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    Subscriber Member jotloob's Avatar
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    Re: accurate long exposure control with tech

    Here is the little brother of the PRONTOR PROFESSIONAL TIMER .
    Total length of the housing is just 5cm .
    That timer was adapted to a mechanical machine . It was a present for me and is now part of my collection .
    Attachment 81160
    Regards . Jürgen .
    -----------------------------------------------------------------------------------
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