Nikon plan APO DIC N2 Apochromatic Microscope Objective. Means zero colour aberrations with incredible clarity and sharpness. If you know your objectives, you'll know these are the most sought-after objectives in the world today. They will be very well packed with. There are no optical problems with these objectives, and I guarantee you they will deliver a perfect image in a compatible Nikon microscope.
They are perfectly fine for professional lab use and imaging. They have not been dropped, and were removed from a leading UK laboratory.
They are strain-free for DIC and Polarised microscopy. OFN 25 (25mm field size).
DIC N2 (compatible with Nikon Eclipse DIC N2 position). WD 1.0 (working distance 1mm). Use with 0.17mm Coverslips.
Fits modern M25 threaded nosepieces or macro systems.