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8" F12 Dob

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Posted by Robert May on January 22, 2002 21:09:23 UTC

Yeah, it's possible but you won't really get any more detail to any extent with the slightly longere FL and the smaller aperture will make most of that go away.
It could be time for you to consider making a long FL cassegrain in the 14-16" size. It would be an interesting first for grinding but if you have a good mirror making group in your club or a nearby club, it's quite possible to make one.
I might note that the tolerances for finishing become a bit easier with the longer FL cass designs as they all approach each other for shape.
If you don't want to go that route, consider the Stevick-Paul design (look for it in the weird telescope pages) as a nice off axis design and do that in the 14" size.

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