Famous Trails Calypso FT700 Night Vision Monocular

Night vision devices gather existing ambient light (starlight, moonlight or infra-red light) through the front lens (1). This light, which is made up of photons goes into a photocathode tube (2) that changes the photons to electons. The electrons are then amplified to a much greater number through an electrical and chemical process (3,4 & 5). The electrons are then hurled against a phosphorus screen (5) that changes the amplified electrons back into visible light that you see through the eyepiece (6). The image will now be a clear green-hued amplified re-creation of the scene you are observing.