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

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    Swarovski NL 8x32 vs Leica Duovid 8+12x42 Brightness Mystery

    Hi John, I'm not surprised that you find the Curios to be very bright under daylight conditions. When your pupils are open to 3mm or less they should be among the very brightest binoculars, as you can see from Gijs' transmission plot.
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    Swarovski NL 8x32 vs Leica Duovid 8+12x42 Brightness Mystery

    The 700 pound gorilla in the room is the "effective aperture" of the binoculars when combined with your iPhone or your eye. Phone camera apertures are only around 2-3mm depending on the model and which lens on the phone camera you chose to use. If we just assume 2.5mm that means that both of...
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