Infinity-Corrected Plan Achromatic POL Polarizing Microscope Objective Lens Set (Spring) 4X 10X 20X 40X 60X with Black Finish | Boli Optics Microscope Store
Nikon CFI Plan 40x/0.65na Microscope Objective Lab Equipment | spectraservices.com
Understanding Microscopes and Objectives | Edmund Optics