Technical Specification Material Linear Dimensions Angles Surface Flatness Surface quality Reflective Index Edges Beveled Ends Entry Faces Transmission Reflection : BK - 7 Glass : ± 0.25 mm : ± 5 arc minutes : 2 wavelength per inch at 546nm : 60 - 40 scratch-dig : 1.517 : approximately 0.25 mm x 45° : fine ground for ease of holding : A.R. Coated ¼ MgF2 : 50% ± 5% at 550 nm : 50% ± 5% at 550 nm

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