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How Much Does Size Matter?

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Posted by Randall Terrell on November 4, 2002 20:00:27 UTC

I'm considering a venture into making a refractor scope (fraunhofer? doublet from Newport Glass). I'm still reading/collecting/reviewing telescope making documents and articles, but I've run into a little grey area. If I'm gonna jump into the wonderful world of glass grinding in a big way, where should I draw the line? I know this is all personal preference and stuff, but that's why I'm asking for guidance.

I've been considering making an 8" scope at about f/14. that seems to be Newports largest production kit run. Well, costs aside, (cuz I don't even want to go there, yet) are there technique or other technical grinding considerations that will arise with the differnce between an 8" refractor and a 10, or even 12 inch one? Keep in mind that I am prepared to make, house, and use a large scope with almost a ten foot focal length. So if i go for a larger diameter faster scope I can keep the length to the same range.

I would appreciate any feed back ya'll might have.
Thanks in advance.

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