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A 50 form type slide arrangement. Prepared by Klaus Kemp. Mounted in Hyrax. Some minor movement of a couple of the diatoms. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Leitz Heine condenser, set to just into dark ground. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 3 image stacks from Zerene (Dmap) pasted together in Photoshop.