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3309_50-150MLenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 150 mm$2.20RAYLENS5045BC72Glass Cylindrical Lens, Bi-Concave 50X45Mm Fl 72Mm$32330550MM-50MMLenses Spherical, Bi-Convex, 50 Mm Diameter 50Mm$4.99 - $440330575MM-100MMMade 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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