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

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  1. H

    Big fan of Porro prism .

    Hi Ron, I experimented with comparing it to the USAF chart by making very large copies of both on photo paper, so that print quality would not be an issue, and then placed them next to each other at a long distance. Accurate sizing, wasn't required, just the same sizing for both. It was...
  2. H

    Big fan of Porro prism .

    A properly executed star-test does the same, as I'm sure Bill knows.
  3. H

    Big fan of Porro prism .

    Well guys, we all know there’s a never-ending parade of different individuals praising and condemning the very same binocular. The sad fact is that the usual hand held evaluations at normal magnification occur in an ever shifting borderland where binoculars with unknown aberration levels and...
  4. H

    Big fan of Porro prism .

    Hi Rathaus, I always try to determine whether a binocular or scope is a lemon before I blame the design. In this case I found no significant sample defects, like astigmatism, coma, pinched optics, etc., in either side of my 2016 Habicht 8x30 or in either side my 1990 version. In a high...
  5. H

    Big fan of Porro prism .

    I'm taking the lazy route and posting a link to one of my posts from another thread on this subject. http://www.birdforum.net/showpost.php?p=3446960&postcount=8 I'll just add a photo made through the eyepiece of my new 8x30 Habicht, which illustrates where the glare problem originates. To...
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