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The focuser on the RC's by GSO are average but the rest is very rigid. Never had any issues with movement on my RC12 and on the RC8 I owned. I have taken some nice image with the RC12. I don't think you could go wrong personally, but you will need to get a good focuser and then be selective about the image scale via sensor pixel size. Mount wise you need something very stable. It's going to be a long focal length and the mount is everything.
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