Optical Glass Lens Set - 3 Dbl Convex, 3 Dbl Concave, 50mm Dia - 20, 30, 50cm FL

Optical Glass Lens Set - 3 Dbl Convex, 3 Dbl Concave, 38mm Dia - 20, 30, 50cm FL

Optical Glass Lens, Double Convex, 38mm Diameter, 20cm Focal Length

EISCO Optical Glass Lens Set - 3 Dbl Convex, 3 Dbl Concave, 38Mm Dia - 20, 30, 5

Round Double Convex Optical Glass Lens - 2" (50mm) Diameter - 50mm Focal Length

Round Double Convex High Optical Purity Glass Lens - 2" (50mm) Diameter -

EISCO Round Double Convex High Optical Purity Glass Lens - 2" (50mm)...

round Double Convex High Optical Purity Glass Lens - 2" (50Mm) Diameter 150Mm Fo