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Baader Q-Barlow Planetarium$81.00
A Barlow lens lets you increase the focal length of your telescope and hence the magnification. The Barlow lens is placed between the telescope and the eyepiece.How the Q-Barlow lens works - Screw the lens element into the barrel of the Barlow and you get 2.25 × the focal length ...A Barlow lens lets you increase the focal length of your telescope and hence the magnification. The Barlow lens is placed between the telescope and the eyepiece.How the Q-Barlow lens works - Screw the lens element into the barrel of the Barlow and you get 2.25 × the focal length.
Alternatively, the lens element can be screwed directly into the filter thread of an eyepiece. This results in increasing the magnification by a factor of 1.3.