The Celestron Luminos Barlow inserts between the eyepiece and eyepiece holder on the telescope and increases the magnification by 2.5x. Premium quality 4-element fully multicoated lens assembly delivers superb field flatness and minimal chromatic aberration.
With tele extenders it is possible to extend the effective focal length of a telescope system, resulting in higher magnification for the observation of the moon, the planets or small Deep-Sky objects with the same eyepieces.
For the first time in astronomical history, a fully multicoated astronomical barlow lens has been designed with multiple CaF2 Fluorite elements (real CaF2 - not common ED Glass!). The result is a stunning performer.