Solomark F50 50mm Guidescope 190mm Focal Length, F/3.4 Focal Ratio, Fully Coated w/Helical Focuser

F50mm F3.4 guidescope with Helical Focuser with Lens diameter: 50mm Adjustable micro-focuser Fully multi-coated doublet Built-in Dew-shield Collimating Rings and Dovetail included Accecpts 1.25" eyepieces & accessories High quality all-metal construction Fits Celestron, Skywatcher, Vixen & GSO type saddles A high quality, compact 60mm aperture guide-scope made of metal-alloy that can be used as a guide-scope or as a large aperture finder-scope with standard 1.25" eyepieces. Internals are painted matt-black to reduce reflections and increase contrast. The built¨Cin dew-shield further reduces reflections and protects the guide-scope's optics from condensation. It has unusually high maximum focus travel of 34mm, 22mm can be achieved via the guide-scope's retractable tube which is marked in single mm intervals. The remaining 12mm can be achieved by the guide-scope's high precision non-rotating micro-focuser which also has a sub-millimetre scale to aid re-positioning and accurate focusing. The non-rotating focuser assembly guarantees that the camera will not turn while focusing which in turn aids framing.