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

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    Blackouts and objective lens size - 30/32mm vs. 40/42mm

    Exit pupil size does influence ease of eye placement (the larger the exit pupil the more forgiving). Blackouts, however, are/should be an eye relief issue - if your eye is too close, blackouts happen. Binoculars with longer eye relief, designed for glasses/spectacles wearers, can be prone to...