3. Prism Material: flint glass, uv fused silica, infrared fused silica, caf2, ge, znse, si etc. Dimension: 4mm-- 100mm Angle tolerance: 30" --3' Surface accuracy: ¬d/10--1¬d Surface quality: 60/40 Clear aperture: 90% Coating: custom design According to custom design to manufacture kinds of right angle prism, equilateral prism, dove prism, penta prism, roof prism from optical glasses. Standard lot.