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Barlow lens


Barlow lens
A diverging lens, placed in front of the focal point of a telescope, that increases both magnification and eye relief when used in conjunction with an eyepiece. The magnification is typically doubled, though at the cost of a fainter image. Invented in 1834 by the English engineer and mathematician Peter Barlow (1776–1862), the lens is used commonly by amateur astronomers.


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   • OPTICS AND OPTICAL PHENOMENA
   • TELESCOPE EQUIPMENT AND TECHNIQUES


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