On Fri, Jul 29, 2011 at 7:52 PM, Peter Johansson wr= ote: > I saw a few replies, did they not pan out? > Unfortunately, CRS didn't reply to my email. Roger posted just now. You might want to get in touch with the homebrew telescope set, as a > fair number of those guys grind their own reflectors, often from > quartz. Apparently it is superior to the more commonly used Pyrex. > I'll try that. Thanks. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .