Quartz glass double convex lens(D40,f=33)
1pc 20mm Glass Double Convex Lens - Optical BK-7 Lens for Photography, Science Experiments, and Optical Instruments
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TGDGFKIAS Glass Prism Optical Glass Lens, 2pcs Diameter 90mm Focal Length 240mm Optical Double Convex Lens Factory Custom Optical Glass Prism And Lens
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