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binoculars

Binoculars

Objective lens diameter
Magnification
Prism
Image stabilization
Special lens coating

Objective lens diameter
The size of the front lens, indicated in millimeters, such as 35mm or 50mm. The size of the lens helps determine the light-gathering power of the binoculars the greater light-gathering ability of a larger lens offers greater detail and better image clarity. This is especially important in low-light conditions, such as at night.

Magnification
The degree to which an object will appear enlarged from life size. With a pair x35 binoculars, for example, objects in view will appear to be seven times closer than they would with the naked eye (the 35 refers to the objective lens diameter).

Prism
Prisms correct the orientation of the images entering binocular lenses. Roof prisms (straight barrel) are preferred in compact binoculars because they are usually smaller and more streamlined, and therefore better able to tolerate rough treatment. Porro (offset barrel) prisms offer a wide field of view and excellent image sharpness, and models using them are usually less expensive than a roof prism model of comparable quality. Prism optics are usually either BAK-4 or BK-7. The finer, higher-density glass in BAK-4 eliminates internal light scattering, creating a sharper image.

Image stabilization
An advanced feature designed to compensate for movement, caused by holding the binoculars, that would otherwise result in shaky or blurred images.

Special lens coating
Lenses can be coated to correct for various distortions and to protect eyes from ultraviolet rays. Coatings can reduce glare and reflection and enhance light transmission, resulting in sharper images and greater contrast. Lens coatings range in quality as follows coated, fully coated, multicoated, and fully multicoated. Coated lenses are the lowest quality. Fully coated lenses are quite economical and should work fairly well. Multicoated and fully multicoated lenses are both excellent.


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