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My 14"SCT coupled to a ZWO174mono with astrodon filters produced many very good planetary images, however nothing beats a correctly built Newt for contrast that's why I changed. A secondary around 20% diameter of a top end main mirror is best, but anything will work especially if you have great seeing! The best camera I have ever used is my current GS3-U3-32S4M-C a newer version CM3-U3-31S4M-CS is now much lower priced.
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