Orion 5122 Long 2-Inch Adapter for Crayford-Type Telescope Focuser Adapter designed for use with the Orion 2" single speed Crayford focuser to allow focus to be achieved with some reflector telescope optical tubes Provides extra height needed when single-speed Crayford focuser is used with Orion 203mm f/4 Adapter is not required for use of single-speed Crayford focuser on Orion Dobsonian telescopes Allows visual use of eyepieces with specialty focuser and some mounted reflector telescope tubes