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  1. #11
    glbeas's Avatar
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    Quote Originally Posted by eumenius
    Yes, as many people here have mentioned already, every B/W material is able to record UV image. The main problem in that case is own fluorescence of some organic compounds and especially film base in UV, what can give overall flare, halo, and ruin the contrast of the image. To record the shortest UV (we had such a need in our lab once), I remember we had to coat the regular non-sensitized photo plate with some kind of synthetic mineral oil, giving a strong visible excitation fluorescence at 205-215 nm wavelength, or close to. That was a kind of sensibilisation, done in a view camera

    Cheers,
    Zhenya
    I once read an article that stated for the highest UV sensitivity or acutance, don't remember which, they etched the emulsion down to leave the silver halide crystals exposed. No mention was made as to how this was accomplished.
    Gary Beasley

  2. #12

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    AFAIK, all films are sensitive to the near ultraviolet. The sensitivity falls off at shorter wavelengths, mostly because gelatine absobs UV. Special UV emulsions used to be available for spectrographic use in the far UV. Ilford may still make them, but possibly only on special order. Some investigators made there own. (Look up Lippmann emulsions.) Very thin emulsions are needed in the far UV.

    As far as camera use is concerned, lenses absorb most UV except the longest wavelengths. There are also focussing problems, since common lenses are designed and calibrated only for visible light.

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