Roof Prism Features: High Precision Dimension Apply Any Anti-reflecting Coating Applications: Instrument Imaging Optics System Projection Systems Optical Measurement Systems | Specifications Roof Prism Parameter Unit Dimension Tolerance mm +/-0.15 Roof Angle Tolerance arc minutes +/-3 Surface Quality 40-60 Flatness »/2 at632.8nm Clear Aperture >90% Coating Specified by customer Material BK7 SF6,Specified by customer