Product Name: Telescope Schmidt Roof Prisms, Right Angle Prisms Laser Prisms Medical Prisms Amici Prisms Model NO.: RFP Customized: Customized Application: Telescope & Binocular Material: Glass Shape: Roof Usage: Beam Bent Type: Roof Prism Scratch & Dig: 60/40~20/10 Flatness: Lambda/2~Lambda/10 P-V Roof Angle Tolerance: 5"~3" Coating: Ar@400-700nm,Ravg<0.5% Fine Grinded Faces: Mat Blacked Origin: China HS Code: 9001909090 Product Description FAQ:1) What is the material frequently used? N-BaK4 (Chinese type H-BaK7) N-BK7 (Chinesetype H-K9L) 2) Do you produce prismby Schott materialetc? We suggest better use Chinese equivalent materialwhich can save the cost. We can also use Schott material, usually the price will be expensive and lead time will be longer.3) Can youmake the coating on theroof prisms? Yes, we can make the AR coating or metal HR coating on the prisms. Also we can do mat blackend on the fine grined surfaces.