also , we need to think more on the precision. Do you think the low end tasco, bushies,leapers, muellers nc star, BSA, etc., are making glass, in airtight rooms, cleanliness to a operating room, with dudes wearing surgical clothes and masks?
nope, you don't think that at all. But the peeps who make glass for zeiss or schmidt and Bender, are the same peeps who make glass for the hubble scope, and other super hi speed / hi technical applications, and the precision , cleanliness, perfection to the edges, curvature, etc., that is required, goes well beyond the normal, for what is done, and we have only talked about the glass so far. You have to pay, all those people, who make hi salaries, just to get that good piece of glass.