Optics Lens includes 6 lenses. All lenses have been ground, polished faces and ground edges All lenses are 50mm One of each: double convex, plano-convex, converging concave-convex, diverging concave-convex, double concave, plano-concave Lenses are stored in wooden box with hinges and latch to keep lenses protected. Optics Lens includes 6 lenses. All lenses have been ground, polished faces and ground edges. All lenses are 50mm. Types One of each: double convex, plano-convex, converging concave-convex, diverging concave-convex, double concave, plano-concave. Lenses are stored in wooden box with hinges and latch to keep lenses protected.