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

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  1. Surveyor

    Transmittance and visual perception

    Prompted by some comments in the Leica BA 8x32 thread I thought I might make some observations for general comments. It is obvious that there is a lot of misunderstanding about the value of transmittance curves on the forum. A transmittance curve is a radiometric measurement of spectral color...
  2. Surveyor

    10x43 ED3 For a friend

    Charles; Thanks much for helping Don with the 10x43 ED3’s. I do not know when he received them but he brought them by here Saturday morning to check out and help him set up. I just did the very basic checks, no review; this was the first pair of this model I have seen. I was suitably...
  3. Surveyor

    Pentax 7x50 Marine Binocular

    This week I found myself needing something with a larger exit pupil than I had on hand for some experiments with exit pupil size versus eye pupil size. I was looking on the auction site for something very cheap because I thought it would just be used for a few tests and retired to the...
  4. Surveyor

    Zeiss Service, A+ again.

    Yesterday I noticed that the lanyard post on my 8x20B’s pocket bins had broken. Instead of sending them back, like the 6x20s in http://www.birdforum.net/showpost.php?p=1575098&postcount=24, I called VA. and they agreed to send me a couple of the inserts. I am delighted with Zeiss service.
  5. Surveyor

    Lab Testing for users

    I have, for a while, been actively looking for someone to do NIST or, preferably, ISO standard tests such as % Transmittance and wave front error tests. I have found a couple but one is in Europe and shipping costs and customs are prohibitive plus 350 Euro/unit. There is one that has been going...
  6. Surveyor

    Monarch 8x36 ATB re-visited

    Last Christmas I bought a pair of Nikon Monarch 8x36 ATB’s to carry in the vehicles as secondary binoculars. After some usage, I noticed that these were hard to focus, sometimes resulting in a sharp image and sometimes not. Both pairs exhibited the same problems but one pair was definitely...
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