Ajax Scientific - LI142-0100 Polished Glass Double Lenses Spherical (Bi-Concave), 50mm Diameter, 100mm Focal Length

Ajax Scientific Polished Glass Double Lenses Spherical (Bi-Concave), 50mm Diameter, 150mm Focal Length

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

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

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

Ajax Scientific Polished Glass Double Lenses Spherical (Bi-Concave), 50mm Diameter, 250mm Focal Length

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

SEOH Lens Glass Double Concave 75mm x 2000mm Focal Length