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

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  1. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Certainly not, I know you're always a very helpful contributor on this forum! I thought the sequence you are suggesting was designed to minimize the impact of the accommodation reflex, which is which I was intent to get as much detail as possible. If the idea is just to view at a...
  2. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Well, I was just trying a get a complete and unambiguous understanding. A bit like the old musket drills ... https://upload.wikimedia.org/wikipedia/commons/7/76/Manual_of_the_Musketeer%2C_17th_Century.jpg They're black and white only, not sure if that qualifies for the Twilight...
  3. H

    Dioptre Setting: Fallacy and Fact

    Hi Patudo, I guess you would have to ask Bill - I'm just trying to get straight the procedure he suggested. Regards, Henning
  4. H

    Dioptre Setting: Fallacy and Fact

    Hi Tenex, Thanks, that looks quite interesting! I actually came across the "no stimulus" focus when reading up for this thread, but I don't think it's necessarily a given that "no stimulus" and "no muscle contraction" coincede. As (asymmetrical) muscle contraction is what Bill wants to...
  5. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Ah, thanks. Let me try again: Set diopter knob to approximately correct dpt values for your eyesight Raise binoculars Focus binoculars on a distant (>1.6 km) target for left eye Defocus binoculars a bit Focus binoculars for left eye, quickly Lower binoculars Focus unaided left eye on...
  6. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Thanks! So as I understand the procedure, it works like this: Set diopter knob to 0 Prefocus binoculars on a distant target for left eye (both eyes open) Focus unaided left eye on a distant target (both eyes open) Raise binoculars quickly to both eyes (both eyes open) Quickly use...
  7. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, What's "the left mechanism" then? The central focus? Regards, Henning
  8. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Very helpful anyway, I didn't actually notice any typos! However, it just occured to me that the "problem fix" paragraph is a bit ambiguous with regard to the controls. I guess you're assuming that the diopter ring is on the left eyepiece, and the center focus is used to bring the...
  9. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Thanks a lot, I believe now I get it. (I'd suggest the explanation would be clearer without the emphasis on staring, but I'm not a native speaker.) I'll give your method a try - I'm not sure I'll be able to spin the focus wheel fast enough to outrace my accommodation reflex, but if...
  10. H

    Dioptre Setting: Fallacy and Fact

    Hi Maljunulo, Relying on wikipedia.de, I believe that's the original 1855 Helmholtz explanation, which since has been expanded (1980s-ish, it seems) by identifying some muscles that support accommodation towards infinity. I believe that would imply a finite (but long) distance for relaxed...
  11. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Is that is the definition of "staring"? I would have thought that it would be advantageous to focus the binoculars so that the difference you describe is zero. Regards, Henning
  12. H

    Dioptre Setting: Fallacy and Fact

    Hi Bill, Reading between the lines, it seems it's implied that "staring" means acommodating the eyes to a fixed, long distance? Regards, Henning
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