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So asked a different way - will a 8" high quality apo give tighter stars than a properly colliminated, and cooled quality 8" RC given both had the same focal length?
I assume the answer should be yes - as the RC will have some thremal currents, it still has a central obstruction. But how much tighter stars will the APO have? Are we talking 5%, 20% or 30% or more?
Curious...
Matt
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