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Bi-Convex Glass Lens, 75 mm Diameter, 175 mm Focal Length
Polished glass with ground edges and 175 mm focus.
Bi-Convex Glass Lens, 75 mm Diameter, 200 mm Focal Length
Polished glass with ground edges and 200 mm focus.
Bi-Convex Glass Lens, 75 mm Diameter, 300 mm Focal Length
Polished glass with ground edges and 300 mm focus.
Bi-Convex Glass Lens, 75 mm Diameter, 500 mm Focal Length
Polished glass with ground edges and 500 mm focus.