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The lenses: Chinese "Baloon" manufactures 75mm, 90mm and 110mm dia. relatively cheap lenses made of glass that are slightly bluishly glaucous.
New (26th August 2001): Glass loupes up to 100mm dia. can be obtained for 60CZK and 130mm loupes for 100CZK at various bazaars in Prague (Holesovicka trznice is the best).
Vyvojova Opticka Dilna Akademie Ved CR (Development Optical Workshop of Czech Academy of Science) makes high-quality (and thus expensive) paraboloid mirror, lenses and filters.