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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. T

    Binomania review of Zeiss Harpia

    I belive the Calcium Fluoride (Fluorite) used by Kowa, Takahashi, Borg and some Canon photographic lenses is manufactured by Canon Optron. Here are a couple of links: https://optron.canon/ja/fluorite/img/pamphlet_caf2_en.pdf https://digiborg.wordpress.com/2019/03/10/canon-caf2-mgf2-1/ John
  2. T

    Binomania review of Zeiss Harpia

    Piergiovanni, The Zeiss Harpia does not have a zoom eyepiece but a variable focal length objective, which enables a constant Afov across the magnification range. AFIK the objective does not contain fluorite (Calcium fluoride crystal) but low dispersion glass, possibly containing fluoride ions...
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