An uncleaned strew slide from Lago di Caldonazzo, Dolomites. Prepared by Brian Darnton. Lots of Fragilaria sp. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo NA 0.65 objective. Olympus Aplanat Achromat condenser, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 21 images stacked in Zerene (Pmax).