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3309_38-50MMLenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 50 mm$1.80LENS38X6Basic Lens Set, 38 Mm, 6 Lenses$12RAYLENS5045BC72Glass Cylindrical Lens, Bi-Concave 50X45Mm Fl 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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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 1000 mm
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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 200 mm
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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 50 mm
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Lenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 1000 mm
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Lenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 200 mm