Optics and personal preference seem to be the foremost, but here is a list of issues you should consider. There are always new models but the inherent designs are still the same.
Binoculars are portable, handy, lightweight and easy to carry. Many binocular lens cloths are available today, and generally they are meant for one-time use. The first is the number of times magnification, and the second is the diameter of the objective lens.
So if you have a pair of binoculars with 8x magnification, they should have an objective diameter of 40. All things you see through a night binocular appear green, because you don't look directly at the objects but at their image on a phosphor screen. Looking at the moon on occasion with a telescope looks like snow has dropped on the surface of the moon.
Some high end binoculars, are so well constructed that they come with a lifetime guarantee. It's really easier to choose when you know more about them.
long eye relief scope - get out hunting or birding with a new pair invention of the telescope - binoculars 101
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