Celestron Barlows
Celestron Barlow lenses allow you to double or triple the magnification of your existing eyepieces. This is a cost effective way to expand an eyepiece set, and can be quite effective for lunar and planetary observing. We are inclined to recommend avoiding the use of Barlow lenses on faint deep sky objects, such as galaxies, because a Barlow will tend to darken these images.