Plano-Convex Lenses Specifications Material: BK7 or UV fused silica Design Wavelength: 546.1nm Design Index: BK7: 1.5183 ± 0.0005 Fused silica: 1.46008 ± 0.0005 Diameter Tolerance: +0.0, -0.15mm Paraxial Focal Length: ±2% Centration: 3 arc minutes Clear Aperture: >80% Surface Irregularity: l/4@632.8nm Surface Quality: 60-40 scratch and dig Protective Bevel Other materials are also available. AR coating is available apon request.