My Nikon Lenses Specifications and drawings can be viewed on the Nikon website. Nikon Microscope Objective Lens CFI Plan Fluor 4x NA0.13 8 / 1.2 WD16.5 Phase Difference PH1, Visible Light-UV Fluorescence Screw 25mm Nikon Microscope Objective Lens CFI Plan Full All Series Although it has been opened, it is new and unused.