Like choosing many other types of technology, choosing the correct NVD is all about how you are going to use it. When most people think of night vision capabilities, they think about spy movies, the military or law enforcement - applications where it is vital for the good guys to see without being seen by the bad guys. A drop in pricing over the past few years has made a NVD affordable for campers, hunters, hikers and a wide variety of other outdoor enthusiasts. However, high-end devices used for specialized purposes remain quite expensive.
There are two broad categories of NVD. Image Enhancement devices collect small amounts of light and amplify them to the point where the human eye can observe the object. Thermal Imaging devices capture the high end of the infrared light spectrum which is emitted as heat by objects. Image Enhancement devices will provide a much crisper image with detail while Thermal Imaging devices show regions of heat. Currently, five Generations of NVD exist. Generations 0 and 1 are less expensive and typically produce a poor image quality. Generations 2, 3 and 4 have increasingly better image quality and an equally increasing price to match.
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