This high performance Antares barlow triples the power of any inserted eyepiece. It features a fully-multicoated achromatic design. This short barlow will work in diagonals or reflectors, has internal darkening and edge-blackened lenses, and is parfocal with most eyepieces. Suitable for high contrast, high power applications in any telescope. Triples the power of any 1.25" eyepiece without adding a very long extension between the telescope and the eyepiece. Insert this into the telescope's eyepiece holder or diagonal first, then insert your eyepiece into the Barlow. Compatible with nearly any telescope which uses 1.25" eyepieces regardless of brand and even those with limited focus range.