Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

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.


Related categories

   • OPTICS AND OPTICAL PHENOMENA
   • TELESCOPE EQUIPMENT AND TECHNIQUES