Newcon Optik came up with an ingenious method to trim costs on their entry-level Stargate night vision device. The Stargate uses a lever-activated power supply and doesn't require batteries! A fast f/1.1 lens aperture, combined with a healthy image intensifier tube, results in great performance for the generation.
There are many different variables that effect the distance that one can see with a night vision device, among them the object's size, the level of details being sought from the object and the conditions of observation. Night vision devices detect much further under a full moon and clear skies than they will under a new moon and cloudy skies. Many different formulas are used to determine the statistic of maximum viewing range and this varies by manufacturer, so ultimately the generation of the intensifier tube is much more relevant than any quoted statistic when determining the maximum viewing range.
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