Olympus Microscope Objective Plan N 4x
20mm thread diameter
Objective is in good condition, has been tested, and produces a good image.
Olympus model microscopes: Fits all Olympus BX40, BX41, BX45, BX61, BX50, BX51, BX43, BX53, and BX63 series microscopes.
This Plan Achromat objective has a flat field and is designed for brightfield microscopy. It's used typically in clinical research and laboratory applications.