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By certification 
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
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
