1,Material: optical glass 2,Surface: spherical 3,Specifications: 30-300mm 4,Structure: plano-concave, double concave 1, Material: optical glass, such as BK7(K9), ZF, ZK...2, Diameter tolerance: +/-0.1mm3, Surface quality: 80-50, 60-404, Coating: MC AR5, Production procedure6, Applications