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3309_50-150MLenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 150 mm$2.203309_50-200MLenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 200 mm$2330550MM-150MMLenses Spherical Bi-Convex, 50 mm Diameter, Focal Length 150mm$1.88 - $152330550MM-200MMMade 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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