Binoculars are actually two telescopes placed side by side so a viewer can see through them with both eyes. Binoculars are used for a lot of things.
The small binoculars are available for general use. Compact binoculars are mostly used by travelers, sportsmen, hunters, bird watchers, and nature lovers. The "10" refers to the magnification power of the binoculars, that is, objects viewed will appear to be 10 times closer than when they are viewed by the naked eye.
The lens size does not indicate lens quality, however the larger the lens size the brighter the view and the larger the field of vision. Lens caps very often get misplaced, so binocular companies attach lens caps to the binocular. Many of the binoculars come with a carry case that can attach to a belt.
Earliest documented history shows Hans Lippershey as the first telescope maker including both monocular and binocular variety even though he is not the first person to actually design and produce such a device. The lower the light situation is, the more powerful night binocular you will need. Higher quality glass also yields brighter images and sharpness.
If field-of-view is important to you, don't purchase the most powerful binoculars you can find. You want to keep these for years to come so you might as well be comfortable.
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