Binoculars are two identical or mirror-symmetrical telescopes designed for simultaneous use by both eyes. This is the worlds most common and most used optical tool that performs a wide varieties of functions. These are the best of all of the observing tools. Astronomy binoculars, one of its kinds, is the best 'first instrument' for astronomy. They are primarily used either for finding objects or viewing in the sky. A vast array of binoculars, in size, shape and purpose, are available for various astronomical purposes. These binoculars open up the incredible and wondrous world of astronomy. The four most important binocular specifications are light gathering power, magnification, objective diameter (and exit pupil), and eye relief. Among these, the most important factor is the light gathering power. To gather sufficient light to see night-time objects, the aperture needs to be at least 40mm. Magnification is the second choice. A high power, large lens binocular, that can magnify an object at least 7 times, is necessary astronomical applications.
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