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

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  1. S

    Ultravid 7x42's and stargazing

    Kevin, My experience is that this, what I use to call "star-filter effect" is less noticable in higher class roofs than in cheaper ones. As well Nikon high-grade (8x20 I tried) and Swarovski show this effect when the light source will be enough bright (especially with a dark background). The...
  2. S

    Ultravid 7x42's and stargazing

    Interesting matter this! Yes, I think it's possible that a larger exit pupil may show some flaw when smaller exit pupil shows a (more) pinpoint star. Also it's not sure that different configurations of same serie and brand have the same optical performance, neither at high-grades optics...
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