Nikon Darkfield Oil immersion condenser that fits all of the former and current microscopes through the Eclipse series, such as Labophot, Optiphot, Microphot, E200, E400, E600, E800, E1000, 50i, 55i and 80i.  This condenser is in excellent condition and gives beautiful darkfield images. The numerical aperature (NA) is 1.43 - 1.20.  The Nikon product number is MBL12000 with a current list price of $792.00.