An arrangement of three Pleurosigma angulatum. Prepared by Flatters and Garnett Ltd. This was an extremely low contrast slide for some reason, so I ended up imaging it in darkground with a Leitz Heine condenser. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Leitz Heine condenser, darkground lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Single image, no stacking.