window.document.getElementById(’post-50′).parentNode.className += ‘ adhesive_post’;Binoculars are 2 mirror-symmetrical telescopes assembled side-by-side and arranged to point accurately in the same direction. This allows the observer to utilize both eyes when viewing distant objects. Compare to a monocular telescope, you do not have to close one eye anymore when using a binocular. It generates a 3-dimensional image with depth perception.
Common optical parameters
Magnification is the proportion of the length of the eyepiece divided fractioned by the central distance of the objective. For instance, a magnification factor of 5 creates an image as if you are 5 times nearer to the object. Most hand-held binocular telescopes have lesser magnifications.
The objective diameter establishes the amount of light that can be accumulated to create the image. It is generally expressed in millimeters. Binoculars are categorized according to magnification x objective diameter (5×50).
Field of view determines the distance in width that is visible at 1,000 yards or how many degrees can be viewed. The type of optical designs used in a binocular dictates the field of view.
Different optical designs
A large number of early binocular telescopes applied the Galilean optics. This type of optical design uses a convex objective and a concave eyepiece lens. One good thing about this […]

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