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

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  1. C

    Star Test Result Question

    Jay: Thank you very much for the link to that article. It is a very intereting read and helpful. Continuing with the star test... Here are two more photos taken today. They are indoors (outside conditions are not good) and the artifical star is 36 ft away down a dark hallway. They are very...
  2. C

    Star Test Result Question

    Think I finally got some useable Outside focus images. As you suggested I redid the foil and tried to put the smallest hole in it that I could. Then I did this test inside. The distance from scope to artifical star is about 36 ft. Attached are an Inside and three Outside focus photos done...
  3. C

    Star Test Result Question

    Thank you Henry. This has been a learning process. The outside tests were done over all grass to try and eliminate as much convection as possible. I even did one of them early in the morning when it was 22° outside before the sun had risen above the peaks. I also tried to do an inside test...
  4. C

    Star Test Result Question

    I could see two, but the second was a challenge to see. I tried again this morning before work. Same results. I have been able to compare four spotting scopes purchased at different times. Our two Pentax (65 & 80) with TeleVue fixed power eyepieces, Swarovski ATX 85mm, and Kowa 883. On all...
  5. C

    Star Test Result Question

    I tried to get more star test images outside today. This is being done hand holding an iPhone to the ocular. I cannot get a good full image of the Outside focus. So here is one Inside focus, and three additional attempts at Outside focus. For the artifical star I used both an LED flashlight...
  6. C

    Star Test Result Question

    Henry, Yes, I’ll try again tomorrow. I had three rings like that earlier today. I messed up the test tonight. Chris
  7. C

    Star Test Result Question

    Henry, Thanks for your comment. On inside focus it was between 2-5 rings of defocus with both scopes. I could see them well enough to adjust between 2-5. On outside focus I defocused until the circle was the about the same diameter as on inside focus. Attached are two photos hand-held...
  8. C

    Star Test Result Question

    I am currently star testing two spotting scopes (Kowa TSN-883 and Swarovski ATX85mm) and I have a question about the results. Photos in a post below. The "star" is an LED flashlight covered with tin foil with a pin hole poked in it and placed 30m away (I measured). On the Kowa: the inside...
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