Diatom strew slide from Mudlake, SW Ottawa, Canada. Gold coated to improve visibility. Prepared by Craig Downing. Mounted in Pleurax and dated 2021. Olympus BHB microscope using 450nm LED light. Olympus 60x Splan Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, brightfield lighting. Olympus 2.5x NFK photoeyepiece. Monochrome converted Nikon d800 camera. 3 images stacked in Zerene (Pmax).