Infinity-Corrected Plan Achromatic POL Polarizing Microscope Objective Lens Set (Spring) 4X 10X 20X 40X 60X with Black Finish | Boli Optics Microscope Store
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Anatomy of the Microscope - Objectives: Specifications and Identification | Labcompare.com
Nikon Objective Lenses
Optics | Nikon Microscope Products | Nikon Instruments Inc.