Specifications Material: H-K9L, lead free optical glass, N-BK7 equivalent Prism Type: Right angle: 45°-90°-45° Angular Tolerance: ±3 arc minutes Dimensional Tolerance: +0.0/-0.2mm Surface Quality: 40-20 S/D Clear Aperture: > 80% Flatness: Lambda/2 @ 632.8nm Corner Chips: none allowed Protective Bevel: allowed up to 0.1mm AR Coating: AR coating on both legs for R<0.25% at 532nm