Ajax Scientific double Bi-concave lens. Made of polished glass with ground edges. Used for reducing the size of speading out light, with two inward curving symmetrical faces. 38-millimeters diameter. 100-millimeters focal length.
Ajax Scientific double Bi-concave lens. Made of polished glass with ground edges. Used for reducing the size of speading out light, with two inward curving symmetrical faces. 38-millimeters diameter. 100-millimeters focal le...
