Nikon CFI plan 10X microscope objective for the current series of infinity generation of microscopes which include the E400/600/800/1000, the 50I/81I and the current CiL model. These have been lightly used and are in perfect optical and near perfect cosmetic condition. The current Nikon number is MRL00102 with a most recent list price of $246.00. The objective is infinity corrected with an NA of 0.25 and working distance of 10.5mm. It does not require Thank You For Looking!