Optical binoculars with BAK4 prisms, digital night vision devices (the FNIRSI NVS-20 and NVS-40, which record 4K video) and thermal imagers that pick up heat differences in complete darkness — three different ways of seeing into the distance or in the dark. For binoculars, magnification and objective diameter matter most: a 7x50 marking means seven-times magnification and a 50 mm lens, which gathers noticeably more light at dusk. With thermal imagers you look at the sensor resolution — 384x288 or 640x512.
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Optical binoculars with BAK4 prisms, digital night vision devices (the FNIRSI NVS-20 and NVS-40, which record 4K video) and thermal imagers that pick up heat differences in complete darkness — three different ways of seeing into the distance or in the dark. For binoculars, magnification and objective diameter matter most: a 7x50 marking means seven-times magnification and a 50 mm lens, which gathers noticeably more light at dusk. With thermal imagers you look at the sensor resolution — 384x288 or 640x512.