... , misoriented substrates, and wafer tolerances are available. Sapphire lenses are custom fabricated in sizes ranging from 1/4 in ... -convex, -concave, meniscus, and dome configurations. Suited for use as protective lenses for night vision systems, cameras, telescopes, and sensors, sapphire ... 40-20 scratch-dig, depending upon size and configuration, lenses can incorporate focal lengths from 3/4 in. to ...