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Binoculars are handheld optical
instruments that use two small telescopes, one for each eye, to magnify distant
objects. They are widely used for a variety of purposes, including bird
watching, astronomy and sports events.
Binoculars consist of a pair of lenses that collect and focus light, and prisms
that bend and redirect the light to the eyepieces. The prisms serve to correct
the orientation of the image, allowing the observer to see the object right-side
up and in the correct orientation.
Binoculars are classified by their magnification and objective lens diameter.
For example, a pair of binoculars with a magnification of 10x and an objective
lens diameter of 42mm is often referred to as "10x42" binoculars. The
magnification indicates how much closer the object appears through the
binoculars compared to the naked eye, while the objective lens diameter
determines the amount of light that the binoculars can gather.
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 Click here for a range of Celestron Binoculars and Spotting Scopes.
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The use of ED glass greatly reduces a visual defect known as chromatic aberration. This is essentially the colour fringing that appears when looking through a pair of binoculars which can distort the true image. Binoculars which use ED glass (see below) are able to stop this from happening. |
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E & O E - ©2024 Sussex Astronomy Centre |
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