Ajax Scientific Polished Glass Double Lenses Spherical (Bi-Concave), 38mm Diameter, 50mm Focal Length

Ajax Scientific Polished Glass Double Lenses Spherical (Bi-Concave), 38mm Diameter, 100mm Focal Length

Ajax Scientific Polished Glass Double-Convex (Bi-Convex) Lens, Spherical, 38 mm Diameter, 50 mm Focal Length

Ajax Scientific Polished Glass Double-Convex (Bi-Convex) Lens, Spherical, 50 mm Diameter, 100 mm Focal Length

Ajax Scientific Polished Glass Double-Convex (Bi-Convex) Lens, Spherical, 50 mm Diameter, 500 mm Focal Length

Ajax Scientific Polished Glass Double Lenses Spherical (Bi-Concave), 50mm Diameter, 100mm Focal Length

Ajax Scientific Polished Glass Bi-Convex Spherical Lens, 100mm Diameter, 500mm Focal Length

Eisco Labs Optical Glass Lens, Double Concave, 75mm Diameter, 20cm Focal Length

American Educational 6 Piece Glass Lens Set