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Rod
I'm not doing F/13 to avoid parabolisation, I chose it from the start but if it can be left spherical then it would be a very nice bonus. The mounting is a non-issue as I have a fairly solid looking undriven equatorial mount that I intend to mount it on. According to google, a 6 inch mirror can be left spherical at F/8 - F/12, depending on the source and an 8 inch can be F/9 - F/13. I also like the idea of using long focal length eyepieces for planetary and lunar views so I can have long eye relief with plossls etc.
Ralph
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