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Pmma Biconvex Lens Diameter 33.7mm Focal Length 32mm Double Convex Optical Lens, High Power Led Lens - Lenses - AliExpress
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CAPPL Biconvex Lens Set, Bi-Convex 37mm Diameter 45mm Focal Length Lens for Google Cardboard V2 (Pack of 4) : Amazon.in: Electronics
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