Penta Angle Prism are widely used in laser level, Image system, precision system, and optical area. For penta prism, the deviation angle of 90 is independent of the orientation of the prism, thus it is particularly important and wide in application which the prism orientation cannot be precisely controlled, we can produce high precision penta angle prism,and make coating according to customer's request. Penta Angle Prism Specifications Material BK7, UV Fused Silica,Sapphire, ZnSe,Caf2,Si,Ge,etc. Size 3mm-380mm Size tolerance +/-0.02mm or customer request Clear Aperture>90% S/D 60-40 40-20 20/10 10/5 Flatness 1/10lambda at 632.80nm Chamfer 0.25mmx45 Angle tolerance