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Glossary > Telescope accessories > Capacity > Type > Barlow lens

Glossary | Telescope accessories | Capacity | Type | Barlow lens

Extends the focal length and thus increases the magnification of a telescope. Is seated between the telescope and eyepiece or camera.

Barlow lenses extend the focal length of the telescope. They are often used to obtain two different levels of magnification with a single eyepiece. If you use a 2x Barlow lens with an eyepiece, the magnification doubles.