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

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  1. J

    Kowa 82 series prisms query

    Hi, Ideally, I would look for a hydrocarbon based vacuum grease for the expected temperature range. Vacuum due to their very low vapor pressures which leads to no or very little gassing out and thus no or very little residue. Silicone grease tends to creep where it is not wanted... like...
  2. J

    Kowa 82 series prisms query

    Hi dipped, great to hear this! Enjoy the view, which is probably as spectacular as my cherry TSN-3... Joachim, now back on the balcony to peep into a mute swan nest across the river...
  3. J

    Kowa 82 series prisms query

    Hi, I am still trying to understand how the the prism coatings were damaged by cleaning them... MgF2 based multicoatings are notoriously inert to chemicals and also not really easy to damage mechanically (both unlike lotus effect based anti rain coatings on objective lenses). If we assume...
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