Olympus Plan Achromat 2X CY microscope objective for the BX series of CY microscopes. This objective features a internal ND filter for optimal light balance on the CY. The Olympus product number is 1-U2B221C and has an NA of 0.06 and a working distance of 5mm. It is new, however used as a dealer demonstrator. The optical condition is pristine and the cosmetic condition is nearly pristine with only a rare little scratch on the metal case. Thanks for looking!