Nikon Interference Phase Contrast System Microscope

Description

This set is in poor condition.  The slider has polarizer degradation/fading on the 20x annulus.  The entire assembly has some mold growth on the optics which results in darkened areas in the field of view(note the large dark spot in the test photos).  The center stops of the condenser annuli are off center.  I tested this with 20x and 40x objectives.  Note: this is intended for use with Nikon short barrel objectives.  The annuli don't match the later DIN 45mm parfocal Nikon objectives(E Plan, E, Plan, CFN Plan, etc.).  The photos were taken with Olympus S Plan 20x and S Plan 40x objectives which I found were a near perfect match for the annuli.