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Quote: i anneal for nearly 50 hours which includes the cooldown to ambient.
20 inch f8 Chief Ed Jones designed and a 17 f9 Zanbuto Wide Band Chief Mike Jones designed .Both unobstructed telescopes .
A 60mm department store refractor started it all....
Quote:interesting pyrex kevin. i had a post a while back about pyrex bakeware being borosilicate glass. of course, its a big controversy today, but i did manage to find out some facts, and with my own testing. i read several articles that stated pyrex was actually pyrex before world kitchen bought them out.