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

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  1. H

    A Brief Review of the Zeiss Harpia 95

    Hopefully "range" will come along to answer, but I notice that his chart appears to track the points from this post by Kimmo Absetz. https://www.birdforum.net/showpost.php?p=3607800&postcount=112
  2. H

    A Brief Review of the Zeiss Harpia 95

    I didn't say so, but I doubt that they did see a better measurable resolution (unless the ATX is a very poor unit). They might have seen a cleaner looking image from the Harpia at 30x magnification and a certain level of low light because their eyesight could be close to diffraction limited at...
  3. H

    A Brief Review of the Zeiss Harpia 95

    If this observation was made at lower magnifications I think the most likely explanation is that the unbiased observers have higher eyesight aberrations when their pupils are dilated beyond the 2.5mm limit imposed by the Harpia, but it's also possible that the ATX used as a reference might not a...
  4. H

    A Brief Review of the Zeiss Harpia 95

    Googling something like "star test telescope" will turn up lots of information. The Bible on the subject is Harold Richard Suiter's "Star Testing Astronomical Telescopes", which will likely tell you more than you want to know. One thing to beware of is examples that use mirrors. Those usually...
  5. H

    A Brief Review of the Zeiss Harpia 95

    Thanks Kimmo. I hope you get a chance to do a more thorough review. 70x seems to be where the objective configuration is optimal. I'll be particularly interested in your star tests and resolution measurements from 60x down to 23x. Henry
  6. H

    A Brief Review of the Zeiss Harpia 95

    Hi Canip, So far it's about what i expected. I doubt that Zeiss was even pursuing an optically state of the art scope with the Harpia. The design appears to be built around a user friendly feature set: a constant wide field over a wide zoom range with long eye relief at every magnification. I...
  7. H

    A Brief Review of the Zeiss Harpia 95

    Last week I had an opportunity to briefly examine a just purchased 95mm Zeiss Harpia. The last time I reviewed a scope (the Zeiss Gavia) I found two days was insufficient for a complete review. This time I had about one hour. The design of the Harpia is so unusual that testing it really demands...
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