Accu-scope Microscope 20x NIS Plan S-APO objective, N.A. 0.50, W.D. 2.1mm

Specifications 20x NIS Plan s-Apochromatic objective N.A. 0.50 Working distance 2.1mm Provides a flat field of view Infinity corrected Corrected for No. 1 ½ coverglass M25 threads Designed for EXC-500 series microscopes Compatible with Nikon E200, E400, E600, Ci, 50/55i Shipping size 9x7x5 inches Shipping weight 1lb This microscope objective is compatible with Nikon E200, E400, E600, CI, 50i/55i and 80i microscopes.  Although it will not be 100% parfocal