A Coscinodiscus oblongus arrangement with 3 diatoms, from Barbado[e]s. Prepared by Frederick Marshall. Intricate flower and leaf etching over the slide. Cracked coverslip, however diatoms still visible. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Olympus Aplanat Achromat condenser, oblique lighting. Nikon 2.5x CF PL photoeyepiece. Monochrome converted Nikon d850 camera. No stacking (single image).