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This Skywatcher Coma Corrector (2") for Newtonian Reflectors is optimised for use with fast Newtonian systems of f/5 or below. This 2-inch fitting accessory does not magnify or reduce the focal length of a system, but substantially reduces edge of field coma that is prevalent in low focal ratio Newtonians - delivering pin sharp images for both photographic and visual use. Supplied with suitable adaptors for visual use. More Information.