Quote:
Originally Posted by Hans Tucker
Apologies in advanced for the stupid question. Can you use different size secondary mirrors on a Newtonian? e.g. Smaller secondary for Planets and larger for DSO's. Is there any advantage to this?
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Definitely not a stupid question. A really good one in fact. This is actually pretty complex with a number of influencing factors to consider and weigh up. I'll reply in detail tomorrow when I have more time, but in some cases and depending on current setup, for visual astronomy there can be some significant gains with a downsized secondary.
Cheers
John B