Having the power to see in darkness has many advantages. The safety applications are the ones that most spring to mind, and thus the tactical price of night vision is established.Night vision binoculars are a fixture in army operations where stealth or night security is required. These wonders of technology give humans the ability of vision in low-light or maybe complete darkness, depending on the technology.

Humans do have night vision, even tho very poor night vision. This is a result of the physiological construction of our eyes that permits us to see more colours, but trades off the power to sense more light. Simply, it is a trade-off between color vision, and light-intensity vision. Night vision binoculars use different technologies to grant humans this critical capability. There are 2 general ways of achieving night vision, and they are to widen the range of detectable “light” or to increase what’s there. True to the trade-off, lots of these devices display pictures in one color or fake color representations.

Some night vision binoculars use infrared light to see. Scopes and other optical devices like these need a source of infrared light illuminating the target object or area to function. These are called active devices. Sadly , the infrared illumination they use can be detected by other devices, so they are used often as deterrents and not for operations that need stealth.

Generation 1 and Gen I + night vision devices use photocathodes to amplify ambient light, like that from the moon. These are rather massive, but are available to the public. Travel binoculars and spotting scopes with night vision capabilities are found among these. Light amplification capabilities for this class can reach as high as 1000x, but regardless of the electrifying nominal rating this isn’t really much.

Generation two and higher night vision binoculars and devices are restricted to army and law enforcement use. These give better night vision, with light amplification ratings at about 20000x for Gen II, and 30000 to 50000x for higher devices. These are the kind employed by Special Forces teams, and members of other agencies that need the capacity, for example Homeland Security, the FBI, and intelligence services.

Lastly, one class of night vision binoculars uses thermal imaging technology. These sense the variations in temperature voiced in lower infrared radiation. The devices then take this data and produces pictures using false colors to represent different temperature levels. Thus, users see silhouettes of objects with areas coloured according to a scale for temperature comparison.

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