The SpaceProbe 130ST EQ is a rich-field Newtonian reflector with a tube only 24″ long compared to the 33″ tube length of the standard 130 EQ. The focal length of the ST’s 130mm (5.1″) primary mirror is 650mm (f/5), producing a wider field of view and brighter images for a given eyepiece focal length. The diffraction-limited parabolic primary mirror is the same type used on much larger reflectors costing substantially more. On a short-focal-length design like this one, a parabolic m (more…)