Nikon CFI Plan Fluor 40X microscope objective for the Nikon E200, E400, E600, E800. E1000, 50I, 80I, and current CIL series of microscopes. It has an NA of 0.75 and working distance (WD) of 0.66mm. This objective is a dealer demonstrator and has just a small amount of metal chaffing as can be seen in the picture. It is new in all other respects. Thanks for Looking!