Glass OPTICS
Lenses
Diameter |
10 to 200 mm |
Diameter Tolerance |
± 0.005 |
Center Thickness Tolerance |
± 0.008 |
Focal Length Tolerance |
± 2% |
Surface Quality |
40:20 |
Surface Irregularity |
1 Fringe @ 633 nm |
Prisms
Plates
Zerodur
Zerodur a registered trademark of Schott AG, is a lithium aluminosilicate glass-ceramic produced by Schott AG. It is used for a number of very large telescope mirrors and Mechvac solutions for the same.
Zerodur has been used for a number of very large telescope mirrors. With its very low coefficient of thermal expansion it can be used to produce mirrors which retain acceptable figures in extremely cold environments such as deep space.
Zerodur has been used for a number of very large telescope mirrors. With its very low coefficient of thermal expansion it can be used to produce mirrors which retain acceptable figures in extremely cold environments such as deep space.