... ), Light transmittance: 85% Concave-convex Lens1), Material: various optical glass.2), Shape: concave, convex, flat, etc.3),Type: Flat-convex lens ... achromatic.5), Structure: concave-convex.6), Accuracy (the highest): N=2/ N=0.5 B=40/20; C=0.017), Specification ... customize this lens for you.8), Pictures: 10) Main products: Optics: Encoders:11) Certificates: 12) More information, welcome to visit: www ...