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llanitedave
Humble Megalomaniac
Reged: 09/26/05
Posts: 12932
Loc: Amargosa Valley, NV, USA
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Re: How Good a Secondary is needed?
07/02/09 06:40 PM
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It's my understanding that the surface of quartz can be given more micro-smoothness than pyrex. I haven't heard that this is a real issue in any practical sense.
Someone with broader knowledge than me will have to chime in about whether there's a real quality difference. To answer the original question, I'd advise to get the highest quality secondary you can afford. Fortunately, they aren't hard to find. The brands mentioned above have excellent reputations.
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"Since the process of science generates more mysteries than it solves, I predict that we'll never learn everything: and we'll continue to generate new ignorance at the speed of knowledge."
"S.O.E." (Sauron's Other Eye), with 16" Royce conical mirror: A permanent work in progress.
10" Homebuilt dob, old Coulter mirror
Under Construction: The "Eye of Sauron" Observatory!
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