Cheap Shutter? Where to find?

Discussion in 'Camera Building, Repairs & Modification' started by gmikol, Jun 9, 2009.

  1. gmikol

    gmikol Member

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    Hi All--

    This may seem like a strange request, but I'm hoping someone out there can help me out.

    Where can I find a fairly cheap shutter? Something with maybe just 1 or 2 speeds in the 1/10 to 1/100 range and a T or B setting? Leaf shutter preferred, as I think it would be easier to adapt than an FP shutter. Clear opening of about 25mm (or more). The shutter in a Kodak Medalist seems a likely candidate, but there's no way I'm going to cannibalize my Medalist for this. So I'm hoping that someone out there who's laid their hands on many more cameras than I might have a suggestion for some cheapy camera to buy that I can salvage the shutter from.

    Why?

    I'm playing around with the idea of a DIY sensitometer, which is, when you think about it, an incredibly simple instrument. In order to get the exposure times down out of the range of potential reciprocity failure in B&W films, I've decided that I'll use a continuous light source and a shutter, so I don't have to worry about warm-up and cool-down of the lamp.

    I know this may seem impractical, but I like experimenting, so humor me?

    Thanks in advance for any help.

    --Greg

    PS-I'm also considering a gravity shutter, but I want to pursue both avenues if possible.
     
  2. Christopher Walrath

    Christopher Walrath Member

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    Try looking for Packard shutters on eBay. There a couple on there and they pop up from time to time.
     
  3. gmikol

    gmikol Member

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    Am I mistaken? I thought Packard shutters were un-timed?

    --Greg
     
  4. BradS

    BradS Subscriber

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    ...but, you'll need a shutter much faster than 1/100 of a second to get into reciprocity failure...right?
     
  5. gmikol

    gmikol Member

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    I suppose I was unclear. I'm looking for an exposure faster than about 1/2 second, as this is where films like FP4 and HP5 start to exhibit poor reciprocity characteristics, according to the data sheets.

    For example, the white light Wejex sensitometer I have sitting in front of me has a fixed 2.5 second exposure time. I suspect that the contrast over a 10-stop range might be different in this realm than in the range of 1/50 to 1/100.

    I hope that makes sense.

    --Greg