In my years of experience with planetary imaging, I have found it hard go go past a good Newt, and my favorite was my 10" f5 carbon strut Newt which I built, which used a GSO mirror set. It was a perfect match for my CGX observatory mount. For imaging the planet's I found the ASI 294 MC camera to be ideal, and I use the non-cooled version for planetary, because I am realtime stacking and aligning with Sharpcap and long subs for planetary are unnecessary.
Don't make It harder than it needs to be. My time spent with an SCT was a waste, constant frustration, with mirror flop, condensation problems, etc. I fail to see the attraction of SCTs for anything to do with Astronomy, except maybe they are easy to transport..
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