Orion 13032 2-Inch Dual-Speed Crayford Refractor Telescope Focuser Give your Orion refractor telescope a smooth dual-speed focus adjustment upgrade! Crayford-style focuser provides smooth roller bearing motion without image shift or backlash 11:1 fine focus ratio allows minute focus adjustments to provide crisp, detailed views Precision drop-in replacement for standard focusers on many Orion refractor telescopes Accepts both 2" and 1.25" eyepieces, diagonals, and telescope accessories