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Nikon Ph2 20x DL 0.4 160/0.17 phase contrast microscope objective

Nikon E Plan 20X/0.4 DL PH2 Phase Contrast Microscope Objective Lens 160mm

NIKON PLAN FLUOR ELWD 20X/0.45 PH1 DM DIC L PHASE CONTRAST MICROSCOPE OBJECTIVE

Nikon #13661 PHASE CONTRAST MICROSCOPE OBJECTIVE LENS Ph3 40 DL 0.55 LWD 160/0-2

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Nikon 40X LWD DL PH3 Phase Contrast Microscope Objective w/ Collar Long Distance