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3309_50-50MMLenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 50 mm$23318G-1Glass Cylindrical Lenses Bi-Convex Power 14D (Focal Length ~72Mm)$32330550MM-500MMLenses Spherical Bi-Convex, 50 mm Diameter, Focal Length 500mm$1.88 - $152330538MM-150MMMade 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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