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Night vision technology has made its way from the armed forces into the mainstream during the last few years. It has various uses in different outdoor activities The technology has moved on over the years to be ready to deal with lower ambient light levels.

Night binoculars operate by sending the incoming particles of light, or photons, onto a photoelectric device. This produces electrons which are passed through a photomultiplier before striking a phosphor screen which becomes illuminated. This produces an image, visible to the human eye but of inferior quality.

Second generation devices make use of a micro channel plate to produce much larger electron streams for improved image results. They do come in at a higher price point. Better quality phosphor lenses are utilized for military purposes but are outside the scope of the domestic market. These units rely on employing the light that is available.

Passive Starlight binoculars use very large objective lenses to catch as much of the available visible light as possible. This is then focused onto a tiny area to produce a viewable image. When I speak of visible light, I am referring to light in the part of the spectrum that the human eye is able to process. Obviously, all light is itself invisible.

Active Starlight binoculars use integrated electronics to intensify the available light to create a clearer image. The drawback is that they rely on a power source rather than just optics. If you are going into the wilderness, make sure you have batteries.

Active infra red equipment works in the same fashion as a normal active device except that they employ light that the human eye is unable to deal with and create a visible image from it. This type of light is emitted by most living things and these devices give you the possibility to observe them when there is no normal light at all.

Image Intensifiers are at the top of the range and use all available light sources, from the visible spectrum and the infra red, to produce a good quality image. This type of technology is normally only used by the military.

Your selection of a night binocular rests on what sort of ambient light you will be operating in and how much you are willing to spend.

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