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3309_50-200MLenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 200 mm$23309_50-300MLenses Spherical, Unmounted, Bi-Concave 50 Mm Diameter Fl 300 Mm$23318G-1Glass Cylindrical Lenses Bi-Convex Power 14D (Focal Length ~72Mm)$32330550MM-50MMMade Of Polished Glass With Ground Edges. Bi-Concave Lens: Used For Reducing The Size Or Spreading Out Light, With Two Inward Curving Symmetrical Faces. &Nbsp;200 Mm Focal Length. &Nbsp;
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