EISCO 6pc Optical Lens Set, 3" - 200mm, 300mm, 500mm Focal Lengths - 3 Double Convex & 3 Double Concave, 3" (75mm) Diameter Lenses - Optically True Glass - Ground, Beveled Edges
EISCO 6pc Optical Lens Set, 2" (50mm) Diameter - 3 Double Convex Lens & 3 Double Concave Lens - 200mm, 300mm, 500mm Focal Lengths - Optically True Glass - Ground, Beveled Edges
United Scientific LCV108 Glass Double Convex Lens, 100mm Diameter, 200mm Focal Length
EiscoOptical Glass Lens Set - 3 Dbl Convex, 3 Dbl Concave, 75mm Dia - 20, 30, 50cm FL
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