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Anything faster than F6 is generally improved by a CC but some go without on F5. I would recommend getting one for an F5 especially for AP with a sensor 1" or larger. The SkyWatcher f4 Aplanatic Coma Corrector mentioned here is the one I would recommend, very good performance, moderate price and no magnification. Coma correctors work best on their rated speed or slower so if you get the F5 skywatcher CC you won't be happy with it if you upgrade your scope. Buy once cry once.
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