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

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  1. S

    Curio 7x21 vs. CL 8x25 pocket

    But a 20x25 has twilight factor of 22,36 so it shows even more detail than 10x25, it's actually as good as 10x50. 25x20 the same. Or why not a 40x25? Twice the twilight factor as 10x25 and better than 10x50. Not really... The twilight factor is not an optical law, but only a way to try to...
  2. S

    Curio 7x21 vs. CL 8x25 pocket

    Here we go again... First of all: I personally consider 10x as too high magnification for a pocket just because of the difficulty to hold it steady. 10x25 has exit pupil of 2,5mm, and therefore exactly the same image brightness as a 8x20, ~30% dimmer than 7x21 and 36% dimmer than 8x25. And yes...
  3. S

    Curio 7x21 vs. CL 8x25 pocket

    I have tried both 7x21 and 8x25, but not compared them side by side. Both provide fully sufficient eye relief with eyeglasses for me. The 7x21 is significantly smaller and lighter which can actually be a deciding factor in whether you bring the binoculars with you or not, if the 7x21 fits in...
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