The use of the night vision binocular depends on the kind of environment you are using it in. Factors such as distance, the kind of night, the weather at the particular time – all result in different binoculars performing differently. So, study the environment well before you make a decision on the kind of binocular you want to buy. Considering this will help in making the binocular more efficient.
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Binoculars use either roof or Porro prisms. Roof-prism or DCF (Dach Center Focus) models have overlapping prisms, while Porro prism (ZCF or Zeiss Center Focus) have staggered ones. The DCF arrangement produces slim, straight H-shaped instruments with eyepieces directly behind objective lenses, while ZCF models are conical or M-shaped instruments. Porro prisms produce greater depth perception and wider field of view.