Optics and personal preference seem to be the foremost, but here is a list of issues you should consider. Bird-watchers, hunters and amateur astronomers are just a few of the people who use binoculars.
When beginning a day of binocular observations, it is tempting to leave the binocular case in the car or at the base camp and rely on neck straps or other attachment mechanisms to secure the unit. The power of the optics is expressed as two numbers, such as 7 x 35. More than a few people have been surprised to learn that binoculars go out of whack when bashed.
Many viewers using prescription glasses do not need them to see through most telescopes and can see more comfortably by taking off their glasses. A good rule of thumb is, unless you are a private investigator or international spy, avoid buying a pair of binoculars with a magnification/zoom greater then 10x's. Viewers can use a pair of binoculars for bird watching, star gazing, observing far off animals, spotting ships at sea, watching a concert, or enjoying a sports game from a nosebleed seat.
The waterproof models will be corrosion resistant and buoyant, not just repelling water from the lens. Many binoculars come with a front cover, which protects binoculars from the rays of the sun. Always make sure that you buy from reputable sellers.
These tips hopefully will lend themselves to your benefit. If you want powerful night vision optics for a cheaper price, consider night vision monocular.
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