OPTICS & OPTICAL PHENOMENA TELESCOPE EQUIPMENT A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site 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 Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP