Nikon E Plan x40 /0.65 Microscope Objective Lens RMS Thread GWO Needs a Clean

A used Nikon E Plan microscope objective, suitable for general bright field microscopy on microscopes like an Alphaphot. It is in good working order but could do with a clean, I've briefly tried it on my microscope in place of the usual lens, I couldn't see any difference between the two on the same for the same slide. Surplus to requirements hence the sale.

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