"Baader Planetarium Q-Turret Quadruplet 1.25"" Eyepiece Revolver has a concave dished compact shape and the forward field stop positions of the optional Baader orthos help to make it very useable on scopes, even when inserted into a diagonal. The net result is a complete range of magnifications instantly available at your fingertips.|Designed for use with optional Baader Q Orthoscopic Eyepieces.|Can also be used with other 1.25"" eyepieces that have a small body diameter.|Concave body shape results in a very short optical path length (38mm), enabling the turret to be used even in many Newtonians.|Also allows you to mount 1.25"" barlows, small cameras, and other accessories. Change from the eyepiece to camera in seconds - perfect for lunar and planetary photography. The Q-Turret enables rapid, and parfocal, changing between an eyepiece and|1.25"" nosepiece is threaded for standard 1.25"" astronomy filters as well as the 2.25x Q-Barlow.|Usable on most scopes, even when inserted into a diagonal. Should have no trouble reaching focus on refractor and catadioptric telescopes. Some reflectors may not have enough in-focus travel.|Click stops at each eyepiece position.|Sturdy yet lightweight plastic/aluminum hybrid construction will not upset telescope balance.|Eyepieces, barlow, camera, etc. not included."