The SharpStar 130mm hyperbolic Newtonian is a very fast telescope with a focal ratio of f/2.8 and a focal length of 364mm. It is a very compact telescope which yields pinpoint stars throughout the entire field-of-view. Owing to its fast focal ratio, it gathers very faint data in a short amount of time. It is a fun telescope to use.br/ Pictured here, a Starlight Xpress Trius 694 with a midi-filter wheel and a Lodestar guidehead are attached to the optical tube. This is an excellent combination of optics and camera.