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

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    Leica, Zeiss & Swarovski binoculars compared: A personal report

    You need to test binoculars on a sunny day with some white clouds and a subject with straight black-white edges. The edges are for looking for red-bue or purple-green fringes near the edge of the field. You can't test this well on a cloudy day. You need to look for birds in a tree at the...
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