Specifications: Convex lens and double convex lens for optical imagine Tolerance:+/-0.01 60/40; 40/20; 10/5 Precision:1/4 lambda Stock lens Convex lens Convex lens with different coating according to your requirements. Specifications of convex lens Material: fused cilica, bk7 grade a or equivalent optical glasses Focal length tolerance: 0.5% Diameter tolerance: +0/-0.1mm or +0/-0.05mm Thickness tolerance: 0.05mm or0.1 Surface flatness: /10 Centration error: 90% of central diameter Coating: ar coating or no. 210*60*40mm box
