Driven by Jiangnan's acclaimed infinity optical system, XD-202 inverted microscopes produce sharp, brilliantly clear images, wh SpecificationOptical ... . 0.25, W.D.6.2LWD PL20x,N.A. 0.40,W.D.3.1LWD PL40x,N.A. 0.55,W ... .0.25, W.D.6.2LWD PH20x,N.A.0.40, W.D.3.1LWD PH40x,N.A.0.55, W ... Canon A640)C-mount with built-in 0.5x lens Xd-202 Inverted Microscope