Night vision expertise has made its way from the military into the mainstream over the last few years. It has many uses in different outdoor activities The technology has advanced over the years to be able to deal with lower ambient light levels.
Night binoculars work by directing the inbound particles of light, or photons, onto a photoelectric device. This emits electrons which are passed through a photomultiplier before hitting a phosphor screen which becomes illuminated. This creates an image, visible to the human eye but of poor quality.
Second generation devices use a micro channel plate to produce much larger electron streams for improved image results. They do come in at a higher price tag. Better quality phosphor lenses are used for military applications but are beyond the scope of the domestic market. These units rely on making use of the light that is available.
Passive Starlight binoculars use very large objective lenses to gather as much of the available visible light as possible. It is then concentrated onto a small area to create 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 of itself invisible.
Active Starlight binoculars use built in electronics to enhance the available light to produce a sharper image. The downside is that they rely on a power source rather than just optics. If you are going into the great outdoors, make sure you have batteries.
Active infra red devices work in the same manner as a normal active device except that they make use of light that the human eye is not able to deal with and create a visible image from it. This type of light is given off by most living things and these binoculars give you the chance to see them when there is no normal light at all.
Image Intensifiers are at the high-end and use all available light sources, from the visible spectrum and the infra red, to create a good quality image. This type of technology is usually only used by the military.
Your choice of a night binocular comes down to what type of ambient light you will be operating in and how much you are willing to spend.
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