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Robert, in general terms the C11 will be harder to use for planetary work than the C9.25 because it has a larger mirror that requres more careful cooling, and holds more air inside the closed OTA that also has to be cooled.
The C14 would be more difficult again than the C11, and requires either perfect thermal environment or a lot of hard work to get it into thermal equilibrium.
There may be specific optical differences as well with the 9.25, I have heard people comment on that but I don't know what they are.
regards, Bird
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