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Thread: information on powder flash?

  1. #31
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    Re: information on powder flash?

    I'm just electronically challenged. I will try to scan them at work somehow.
    Science is what we understand well enough to explain to a computer. Art is everything else we do.
    --A=B by Petkovšek et. al.

  2. #32
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    Re: information on powder flash?

    Sorry this is so low-quality. It wasn't intended for any audience, the camera was just the only way I could think to compare the brightness of powder flash. It's the same film strip printed twice. The top exposure was printed with 4 stops more exposure on the enlarger than the bottom exposure.

    This is also a great testament to the latitude of Tmax 400.

    Science is what we understand well enough to explain to a computer. Art is everything else we do.
    --A=B by Petkovšek et. al.

  3. #33

    Join Date
    Sep 2007
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    AZ
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    4,431

    Re: information on powder flash?

    I know you wanted a sustainable, DIY solution. But Here is a couple of cave photographer sites I stumbled upon a couple years ago, they have good luck with the old flashbulbs:
    http://www.forums.caves.org/viewtopic.php?f=4&t=9849
    http://www.darklightimagery.net/flashbulbs.html

  4. #34

    Join Date
    Jun 2011
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    Lawrence, KS
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    40

    Re: information on powder flash?

    Ok, that is . . . awesome.

    Something about that contact sheet is just so comical; like "third times a charm"... BOOM!

    I mean, the light appears to have even jumped the frame.

  5. #35
    hacker extraordinaire
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    Re: information on powder flash?

    I'm going to reshoot the test with a real camera when I get a chance. I'm still perfecting the ratios as well. By volume, the ratios of potassium perchlorate and aluminum powder I've been using are about equal...maybe 10% more perchlorate. So the flash in the contact sheet is about 1/3 of a 35mm canister full of aluminum and just slightly more than that of perchlorate.

    I'm trying to rig something up to sync the flash with a shutter...I found that you can buy flashpots that magicians use to create puffs of smoke...I don't know if they would work well or not. I'm probably using a bit more powder than stage magicians use.

    http://www.nightmarefactory.com/cgi-...&search=action
    Science is what we understand well enough to explain to a computer. Art is everything else we do.
    --A=B by Petkovšek et. al.

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