The optics field is quite large and the number of products is considerable. Widely used for stargazing, bird watching, hunting, and fishing, binoculars are of great use to sport and nature lovers.
Binoculars are just more comfortable to look through and hold steady because both hands are usually used. Nitrogen-filled binoculars resist water, rain, and moisture. Using binoculars, the avid birdwatcher can be sure he really saw the rare Bonaparte s Nightjar or Pink-Headed Fruit Dove, not just another sparrow or bluebird.
Size matters when one considers the mode of birding. When night-vision binoculars first came on the market they were very expensive status symbols. Binoculars for deer hunting might not be the best type that you would use for hunting rabbits.
A few compact binoculars come filled with nitrogen and are waterproof. If you are still in your twenties you can probably use all of that 7mm exit pupil above as your pupils will dilate to about that size in very dark conditions, however as you get older your pupil does not dilate more than about 4 to 5 mm so large exit pupils are wasted. Others have comfortable straps so you can wear them around your neck.
But if you're into astronomy, you'll need a high powered pair. Nevertheless, the capabilities of binoculars appeal to both groups as they choose equipment that best fits their needs.
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