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Optimized for Quattro imaging Newtonians, the Sky-Watcher Quattro Coma Corrector, delivers stunning wide-field views with pinpoint stars to the edge of the field while the magnification remains unaltered. Made with extra-low dispersion (ED) FPL51 and Schott glass with a fast f/4 focal ratio for imaging, this accessory corrects for chromatic and spherical aberrations that create halos to appear around bright stars and other objects and cause colors to shift. Using the corrector enables users to achieve tack-sharp focus with true color rendition across the entire field of view - especially at the edges. It fits into 2" focusers and requires a backfocus of 55mm (2.16").