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

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  1. H

    Focussing: Just Do It!

    Hi Omid, Cool presentation, thanks a lot for sharing! My favourite is the angular diagram on "Human visual attention". I suppose "text" means that one is able to read text within a centered 20° cone? Regards, Henning
  2. H

    Focussing: Just Do It!

    Hi John, Absolutely, there's certainly no reason to consider the human visual capacity to be anything outstanding! A while ago, I read an article about the colour-differentiation capabilities of the typical bird's eye - which are so fantastic that it can be quite depressing to think about...
  3. H

    Focussing: Just Do It!

    Hi Omid, I see - thanks for the clarification! Well, from a computer science perspective, I woudn't the eye to produce a literal sharp image, but to extract key information from a series of appropriately focused images. I'd imagine that probably, experiments with pictures shown only for...
  4. H

    Focussing: Just Do It!

    Hi Ed, That is indeed fascinating, thanks a lot! :-) Longitudinal chromatic aberration does seem to check the box for providing the direction for accommodation, too. However, if that's the primary mechanism, there are secondary mechanisms as well? For example, it's possible to focus under...
  5. H

    Focussing: Just Do It!

    Hi Tenex, Are you referring to Head-Up Displays? I would think these only make sense if its displayed image is in the same focal plane as the objects the pilot is looking at in flight, which would be "near infinity". Regards, Henning
  6. H

    Focussing: Just Do It!

    Hi John, Thanks for the recommendation, I just ordered a copy of Holger's book! Regards, Henning
  7. H

    Focussing: Just Do It!

    Hi John, As an interested layman, I find it increasingly difficult to follow the highly interesting discussion whenever additional elements get added to the experiment, or when measurements are mentioned, as I'm not always sure of the precise context (which the pros obviously are). In other...
  8. H

    Focussing: Just Do It!

    Hi Bill, If you're talking about the graphics you attached to the post I'm quoting, is the sequence supposed to be left-to-right first, then down, or is it supposed to be left column down, then right column down? Regards, Henning
  9. H

    Focussing: Just Do It!

    Hi Ed, Thanks a lot, that's really interesting material! Couldn't Bill's "staring" be understood as a technique to either avoid instrument myopia, or to focus the instrument so that the eye's refractive state corresponds to Hennessy's "intermediate resting state"? I can't judge whether this is...
  10. H

    Focussing: Just Do It!

    Hi Bill, I admit that I always had difficulties understanding your use of the term, but now I believe I see what you're aiming at. "Working point" might be a term more appropriate to electronics than to physiology, but I'll keep that concept in mind in case I ever stumble upon something...
  11. H

    Focussing: Just Do It!

    Hi Richard, Ah, that was Alexis' statement, but I as understand him, the interesting aspect for our discussion was in fact range of accommodation. I hope we're all on the same page regarding that aspect! :-) Regards, Henning
  12. H

    Focussing: Just Do It!

    Hi, Where would we? Regards, Henning
  13. H

    Focussing: Just Do It!

    Hi Alexis, Thanks for sharing that observation, that's something I was really curious about! (And just what I had mistakenly thought John had pointed out - thanks for fixing my world so quickly! ;-) Regards, Henning
  14. H

    Focussing: Just Do It!

    Hi again, If my above message makes less than perfect sense, that might be because I got confused by the ambiguity in the use of "dioptre" in the English language - my apologies! John, I would love to hear if Miss C did in fact repeatably set the same focussing wheel position for the same...
  15. H

    Focussing: Just Do It!

    Hi John, Thanks, that's an interesting result indeed! I suppose your surprise is owed to the fact that she did set the dioptre consistently, not so much that it's the same regardless of distance? I recently handed my Papilios to a 10-year-old, and while she was curios about the focussing...
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