Glass Lenses - Double Concave, dia 50mm, focal length 300-1000mm

Glass Lenses - Double Concave, dia 50mm, focal length 300-1000mm Double Convex Spherical lenses, optically worked glass, with ground edges, highly polished.Spherical, optical

Glass Lenses - Double Concave, dia 50mm, focal length 300-1000mm ALTEC Laboratory Equipments and ALTEC Laboratory Instruments Tenders.