SKYWATCHER F4 APLANATIC COMA CORRECTORF4 Aplanatic Coma Corrector Only for use with F4 Newtonian. The Sky Watcher 2 F4 Coma Corrector is designed to overcome the vignette effect that occurs in Newtonian telescopes. This allows you to see pin point stars across the whole field of view. Magnification remains the same. It helps astro imagers improve their photos of the sky. Its optimised for use in all Sky watcher fast ratio (f 4) Newtonian Reflectors with 2 focusers. Youll need to purchase
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