A very good quality yet very affordable 3x Barlow lens for 1.25". Due to the use of an ED element colour correction is improved, resulting in a sharper image and better contrast. The Barlow can also be used photographically, especially for planetary imaging or for taking photos of small details on the moon. The large clear aperture of 24 mm offers ideal illumination without vignetting on any 1.25" eyepiece. Coating: fully multi-coated, Connection to eyepiece:1 1/4",Connection to telescope:1 1/4", Unobstructed diameter:, 24 mm, Magnification:3 x, Optical design:ED element