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Night Binocular Technology - Which Types Of Night Vision Technologies Are Available
Night vision technology has made its way from the defense forces into the mainstream over the last few years. It has numerous applications in a variety of outdoor activities The innovation has moved on over the years to be ready to deal with lower ambient light levels.
Night binoculars work by sending the incoming particles of light, or photons, onto a photoelectric gadget. This emits electrons which are passed through a photomultiplier prior to striking a phosphor screen which becomes illuminated. This produces an image, visible to the human eye but of low quality.
Second generation devices make use of a micro channel plate to generate much stronger electron streams for improved image results. They do come at a higher price point. Better quality phosphor lenses are utilized for military applications but are beyond the scope of the domestic market. These devices depend on making use of the light that is available.
Passive Starlight binoculars use substantial objective lenses to capture as much of the available visible light as possible. This is then concentrated onto a small area to produce a viewable image. When I talk about visible light, I am referring to light in the part of the spectrum that the human eye is capable of processing. Obviously, all light is itself invisible.
Active Starlight binoculars use integral electronics to amplify the available light to create a clearer image. The disadvantage is that they rely on a power source rather than just optics. If you are heading into the wilderness, make sure you have batteries.
Active infra red equipment works in the same way as a normal active device except that they employ light that the human eye is unable to process and create a visible image from it. This kind of light is emitted by most living things and these devices give you the ability to observe them when there is no normal light at all.
Image Intensifiers are at the top of the range and utilize all available light sources, from the visible spectrum and the infra red, to produce a good quality image. This kind of technology is normally only used by the military.
Your selection of a night binocular comes down to what sort of ambient light you will be working in and how much you are willing to pay.
Bushnell
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