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Specifications: D=Diameter,F=Focal length, Unit: (MM) For example: Biconvex D30 F50 means: Diameter 30mm, Focal length: 50mm Biconvex lens Biconcave D30 F-75 means: Diameter 30mm, Focal length: -75mm Biconcave lens Plano Convex D50F300 means: Diameter 50mm, Focal length: 300mm Biconvex Plano Convex lens Material: optical glass Diameter: 30mm 40mm 50mm 75mm Features: High temperature resistance, explosion-proof, non-aging, excessive strength, high gentle transmittance, uniform light spot, no black holes, shadows, dark places Uses: Suitable for lights products similar to sensors, optical instruments, floodlights, and so forth Package includes: 1 x Glass Lens