Fabulous Water Drop Photography [PICS]

Discussion in 'Digital SLR' started by gizmod.brian, Jul 11, 2007.

  1. gizmod.brian

    gizmod.brian Guest

    gizmod.brian, Jul 11, 2007
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  2. gizmod.brian

    DoN. Nichols Guest

    Well ... I've seen how Dr. Edgerton re-shot his famous milk-drop
    photo in color at MIT (the original was in B&W).

    1) A thin film of milk on a colored glass plate (in a Petri dish).

    2) A steady source of milk drops from a pipette on a stand.

    3) A sensor to trigger on the next milk drop above the one which
    is about to hit the milk.

    4) A low-intensity strobe pointed away from the subject.

    5) A photo sensor in the path of that strobe which triggered the
    high-intensity one actually taking the photo.

    6) Fine tuning of the timing was accomplished by moving the photo
    sensor in (5) above to let the speed of light make very small
    adjustments to the timing

    7) Polaroid film in a 4x5 camera to verify the timing, and then
    substitute a color film of choice.

    DoN. Nichols, Jul 11, 2007
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  3. gizmod.brian

    policy_wonk Guest

    6) Fine tuning of the timing was accomplished by moving the photo
    sensor in (5) above to let the speed of light make very small
    adjustments to the timing

    I don't think so. Do the math.
    policy_wonk, Jul 11, 2007
  4. It is alleged that claimed:
    A high speed camera on continuous shooting, then save the best image.

    Jeffrey Kaplan www.gordol.org
    The from userid is killfiled Send personal mail to gordol

    "I always wondered about the exhortation to "Put litter in its place!".
    The place for litter is on the ground, otherwise it wouldn't be
    litter." - seen on usenet
    Jeffrey Kaplan, Jul 11, 2007
  5. gizmod.brian

    DoN. Nichols Guest

    I know what I saw there (and what he described). I was standing
    right beside him, with one other person there, late at night in his

    Those were *very* small tweaks to the timing.

    DoN. Nichols, Jul 12, 2007
  6. gizmod.brian

    Wayne Guest

    Well, you could move the photo sensor up or down (earlier or later) in path of
    the moving drop, which certainly would affect the timing of the strobe
    trigger, which is what I think was described. The way it is done today is
    with a variable one-shot delay between photosensor and strobe trigger, which
    is easier than moving the sensor physically. This uses the speed of the drop,
    not the "speed of light". The "speed of light" can be considered infinite for
    this purpose, and has absolutely nothing to do with it.

    The drops that were linked are just average drops, but with good color added.
    If you want to see some great drops, checkout http://www.pbase.com/daria90
    which makes me green with envy.
    Wayne, Jul 13, 2007
  7. gizmod.brian

    Richard H. Guest

    If you like those, you'll love these:

    In his blog, he describes the equipment he's built to trigger the shots.
    Absolutely awesome.

    Richard H., Jul 13, 2007
  8. gizmod.brian

    DoN. Nichols Guest

    That was (of course) the coarse timing adjustment.

    He did still have the optical link between the low-power strobe
    pointed away and the movable photosensor. This was about 1960, FWIW.
    The speed of light is such that a nanosecond can be represented
    by a quite short length of wire easily held in one hand. But he *was* doing
    such motions of the detector to adjust the timing. (Perhaps the
    response time of the detector was in part a function of the intensity,
    so he was adjusting the time delay needed to reach the threshold of the
    detector. Since the light would fall as the square of the distance,
    this may have been what he was actually using.
    Those are excellent examples.

    DoN. Nichols, Jul 13, 2007
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