... Lens 1), Brand: HENGXIANG 2), Material: optical glass 3), Light transmittance: 85% Concave-convex Lens1), Material: various optical glass.2), Shape: concave, convex, flat ... -concave lens, double-convex lens, double-concave lens, etc4), Usage: optical achromatic.5), Structure: concave-convex.6), Accuracy (the highest): N ...