About the Sky Mentor 3X Five Element Barlow Lens... The Sky Mentor 3X Five Element Barlow Lens - 2" will come in handy for extending the effective focal length of short-tube telescopes, to give them more magnifying power. It is the most powerful 2 inch barlow in existence, period! The Sky Mentor Optics Barlow employs a sophisticated 5-element lens configuration engineered to render optically flatter, sharper images than standard barlows can provide. The lenses of the Sky Mentor 3X Five Element Barlow Lens - 2" are fully multi-coated to ensure high light throughput, and their edges blackened for improved contrast. A non-marring compression ring secures the eyepiece in place. Slotted barrels prevent accidental slip-outs, and dual rubber grip bands on the housing ensure easy handling. One-year limited warranty. Sky Mentor 3X Five Element Barlow Lens - 2" Features... This premium, high-power barlow lens increases the magnification of any eyepiece by 3x Ideal for high-power lunar and planetary viewing, and solar system imaging Five-element lens design renders optically flatter, sharper images than standard barlows Fully multi-coated optics for high light throughput; glare-threaded barrels for superior contrast Non-marring compression ring secures eyepieces in place Sky Mentor 3X Five Element Barlow Lens - 2" Specifications... Equipment Type: Barlow Lens Magnification Factor: 3X Barrel Size: 2" Eyepiece Acceptance: 2" or 1.25" w/ included adapter # of Elements: 5 Coatings: Fully multi-coated Sky Mentor Product Number: SMT-3XBARLOW-2