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

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  1. RJM

    my review of Kowa TSN 883 Prominar (also with astronomical eyepieces)

    I finally got to do a brief side-by-side last week. The AFoV in the new eyepiece is HUGE at 60x. So much so that I could barely see the fieldstop unless I pressed into the eyepiece which made it somewhat less comfortable than the old at high power. I probably should have tried to adjust the...
    • RJM
    • Post #13
    • Forum: Kowa
  2. RJM

    my review of Kowa TSN 883 Prominar (also with astronomical eyepieces)

    All fieldscopes share a prism window opening of ~20mm or less which limits WIDEST TRUE FIELD non-vignetting eyepieces to an AFoV of ~70deg and ~fl=22mm at the best. Its possible to use ultrawide ~85deg AFoV eyepieces but their focal length would be limited ~17mm or less. Also because the...
    • RJM
    • Post #4
    • Forum: Kowa
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