Night Vision Binoculars
Night vision binoculars use a series of electro-optical devices to intensify existing light, allowing the human eye to discern images in much darker or lower-light environments than regular binoculars. Because of this electro-optic technology, night vision binoculars are capable of making observances across a range of spectrums, from the visible through to the infra-red.
The ‘green field of view’ effect is caused by a phosphor screen, onto which the electronically-enhanced image is projected. This allows the human eye to discern movement and outlines much clearer- the eye can determine between more shades of green than other phosphorescent colors. Light enters night vision binoculars through an objective lens, just like in a standard refractor or catadioptric scope. The difference between the two, however, is that the light entering a pair of night-vision binoculars is focused on to a positively-charged photo cathode powered by the binoculars’ built-in power supply (normally a rechargeable battery pack). This energy charge is then propelled through a vacuum inside the binoculars, where it strikes the phosphor screen and is displayed as an image. The eyepiece then takes this image, magnifies it, and transmits it to the human eye.
Night vision binoculars operate in a very similar fashion to modern digital cameras, and the screens can be adjusted to produce a series of different image magnifications. The theory behind magnification is simple - the higher the magnification of the binoculars, the further the distance visible. However, as you zoom progressively closer, the field of view becomes more restricted, and the image may not be quite as clear as a lower magnification could provide. Using their advanced optics, many night-vision binoculars feature image-adjusting compensators for this type of viewing.
Binoculars that have been specially adapted for the military are often fitted with a whole array of extras that the civilian market would never need. Thermal imaging, night vision and extra-tough shock-resistant casings have all been developed and amalgamated into military binoculars, with night vision being by far the most prevalent. The tactical advantages of night vision in military operations makes night vision binoculars a vital part of every routine combat patrol.
Night vision is also regularly employed in the security industry, and by police officers. The technology allows for the tracking, tracing and identification of criminals in light conditions that may not be the best in the world. They are also used by hunters, photographers, and safari tourists as well.
Straight Spotting Scope