K9 plano-convex lens diameter 12.7mm focal length F12.7mm F25mm F38mm F50mm

K9 Flat Convex Lens 12.7mm Focal Length F12.7mm F25mm F38mm F50mm

K9 Plano-Convex Lens Diameter 12.7mm Focal Length F12.7mm F25mm F38mm F50mm

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