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Hi Mick, I think the optimum scope for deep-sky is different to the optimum scope for planetary imaging... are you looking for something that will be good both of these, or just optimum for one of them?
For planetary work it seems the optimum scope is somewhere in the 10" - 14" range, but for deep-sky I guess the larger the better (as long as you have the EQ mount to take it!).
Planetary work on larger scopes quickly becomes problematic. Large mirror take longer to cool and the seeing conditions required for high res work and large mirrors are harder to find.
For deep-sky I think it comes down to the largest weight that your mount can take and still track accurately...
regards, Bird
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