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While you don’t always need special gadgets to watch celestial events light up the sky, telescopes and binoculars allow you to get a better look at space-related phenomena. The summer is filled ...
The desirable amount of magnification depends upon the intended application, and in most binoculars is a permanent, non-adjustable feature of the device (zoom binoculars are the exception). Hand-held binoculars typically have magnifications ranging from 7× to 10×, so they will be less susceptible to the effects of shaking hands. [ 25 ]
The ratio between the maximum and minimum magnifications of a variable-power sight is known as its "zoom ratio". Confusingly, some older telescopic sights, mainly of German or other European manufacture, have a different classification where the second part of the designation refers to light-gathering power.
However the AN/PVS-4 does have a reputation for holding zero and being able to withstand high recoil, making it popular amongst enthusiasts who are able to get a reasonable good condition item. The optics are considered exceptional, even by contemporary standards and the biggest drawback compared to modern scopes is the weight.
Angular field of view is typically specified in degrees, while linear field of view is a ratio of lengths. For example, binoculars with a 5.8 degree (angular) field of view might be advertised as having a (linear) field of view of 102 mm per meter. As long as the FOV is less than about 10 degrees or so, the following approximation formulas ...
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