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  1. #21

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    what kind of camera do you use and what is your typical exposure time? I understand that you want to build an integrating lightmeter that display remaining time. But since it's integating and the light is changing shouldn't it display percentage of exposure with 100% is complete

  2. #22

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    Quote Originally Posted by nick mulder View Post
    Bettersense has linked his project above - pretty much exactly what I described earlier. Heaps of work done for you right there !
    Yes and pretested too!
    I will try it and see how it works out.

  3. #23

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    I watched a Charles & Ray Eames short recently on how Polaroid cameras worked, and it described how a light sensor would trigger the end of exposure when the right amount of light had been let in.

    It seems therefore that it would be possible to modify one to provide the timing information you require.

  4. #24

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    Quote Originally Posted by Chan Tran View Post
    what kind of camera do you use and what is your typical exposure time? I understand that you want to build an integrating lightmeter that display remaining time. But since it's integating and the light is changing shouldn't it display percentage of exposure with 100% is complete
    MF Mamiya with exposures expected to range from 1 sec. to perhaps an hour... A % display w/o time indication would not be ideal... as I hope the lighting exhibits no actual variation and therefore exposure duration may actually be predictable... and I have a better sense of how long x minutes or seconds are than how long 3 or 7% takes to complete. But, yes either could be used.
    Last edited by Ray Rogers; 05-17-2010 at 10:57 PM. Click to view previous post history.

  5. #25
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    I would have made one by now but had the issue of wanting into integrate UV light intensity over time only - I needed a UV band pass filter... There were lots of ideas around it but they all equated to equal or more work than building an indoor UV bank anyway - so I built one of those and haven't looked back since
    Cleared the bowel problem, working on the consonants...

  6. #26

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    Quote Originally Posted by Graham06 View Post
    I watched a Charles & Ray Eames short recently on how Polaroid cameras worked, and it described how a light sensor would trigger the end of exposure when the right amount of light had been let in.

    It seems therefore that it would be possible to modify one to provide the timing information you require.
    They actually had sensors in them? I think the only one I ever owned was a Swinger (?) all I remembe about it was it was white, had a hand strap and two speeds, 75 (in red) for color and 3000 for B&W. I always thought it strange polaroid B&W film was so fast

    Anyway, I thought they simply used mechanical timers for the shutters.

    (Where did you see the short? On the Internet?)
    Last edited by Ray Rogers; 05-17-2010 at 11:00 PM. Click to view previous post history.

  7. #27

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    Quote Originally Posted by Ray Rogers View Post
    They actually had sensors in them? I think the only one I ever owned was a Swinger (?) all I remembe about it was it was white, had a hand strap and two speeds, 75 (in red) for color and 3000 for B&W. I always thought it strange polaroid B&W film was so fast

    Anyway, I thought they simply used mechanical timers for the shutters.

    (Where did you see the short? On the Internet?)
    I got a dvd set as a gift, but I just found it online here:
    http://www.youtube.com/watch?v=4EdwmaQltHc
    It's a lovely piece of work, and it makes one excited about this amazing piece of futuristic technology.

  8. #28

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    Quote Originally Posted by Graham06 View Post
    I got a dvd set as a gift, but I just found it online here:
    http://www.youtube.com/watch?v=4EdwmaQltHc
    It's a lovely piece of work, and it makes one excited about this amazing piece of futuristic technology.
    Yes it is quite a tribute, once it gets gets going. Thanks!

    (ps: I may have something related that might be of interest if actually related; I will try to post it if I get the time)

    Ray

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