E52-IC20B-N D=6.4 E52-IC20B-ND3.2 E52-IC20B-ND6.4 E52-IC20C D=3.2 E52-IC20C D=6.4 E52-IC20C-3.2 E52-IC20C-4.8 E52-IC20C-6.4 E52-IC20C-N D=3.2 E52-IC20C-N D=4.8