D12 F20 Diameter 12mm focal length 20mm optical glass lens Sent E-mail INQUIRY DETAILS D12 F20 Diameter 12mm focal length 20mm optical glass lens ←[Previous:D12 F20.7 Diameter 12mm focal length 20.7mm optical glass lens] [Next:D12 F15 Diameter 12mm focal length 15mm optical glass lens]→ RELATED D15 F40 Diameter 15mm focal length 40mm plano convex lens D15 F-20 Diameter 15mm focal length -20mm BCC Biconcave double concave lens D15 F-36 Diameter 15mm focal length -36mm BCC Biconcave double concave lens D15 F-40 Diameter 15mm focal length -40mm BCC Biconcave double concave lens