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A barlow lens is a type of negative lens that is used to increase the effective focal length of a telescope or other optical instrument. It is named after the English optician Peter Barlow, who invented it in 1834.



The barlow lens is placed between the eyepiece and the object being viewed. It magnifies the image by increasing the effective focal length of the telescope.

This allows the telescope to gather more light, which makes the image brighter and sharper.

The barlow lens is a valuable tool for astronomers because it allows them to increase the power of their telescope without changing the eyepiece.

This makes it possible to view faint objects that would otherwise be invisible.