SharpStar 2" 0.95× Coma Corrector Sharpstar 2" 0.95× coma corrector can be applied to most marketable Newtonian reflective astrographs. It’s of high quality and easy to use. Sharpstar 2" 0.95× coma corrector is designed for APS-C imaging circles(28mm), suitable for Newtonian reflectors with focal ratio between f/3 and f/6, and aperture size from 150mm to 600mm. The reduction factor is 0.95×, thus it can reduce the original f/4, f/5 and f/6 respectively to f/3.8, f/4.75 and f/5.7, effectively shortening the exposure time. Besides, it can improve the star shapes. The diameter of stars in the center of the field can be limited within 10um. Technical Specifications Specification Application 150-600mm, f/3-3/6 parabolic reflectors Reduction factor 0.95× Image circle 44mm(maximum), 28mm(optimal) Lens triplet structure Outer diameter 50.8mm(2") Back focus 56mm(starting from the field-stop-ring to the focal plane) Length 79.7mm Coating full-surface multi-layer coatings Weight 0.22kg In the Box SharpStar 2" 0.95× Coma Corrector Warranty & Manuals SharpStar Warranty
