Coscinodiscus elegans from Santa Monica. Single example on the slide. Prepared by Frederick Marshall. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 9 images stacked in Zerene (Pmax). Diatom mounted too deeply to use the 63x Leitz Pl Apo NA 1.40 objective.