cr-39 optical lens 1. various types: cr 39 1.499, 1.56, 1.61, 1.67,1.523 2.uncoated, HC, HMC 3.Diameter: 70, ... 65,60, 55 cr-39 optical lens1. various types: cr 39 1.499, 1.56, 1.61, 1.672.uncoated, HC, HMC3.Diameter: ... 1.523, 1.70, uncoated & A/R, size 65/70 mm)2. CR-39 LENS (index 1.499, 1.56, 1.61, uncoated, H/C ... , H/M/C, size: 65/70/72 mm)3 ...