A beautiful arrangement of diatoms and sponges by Watson and Sons Ltd. Olympus BHB microscope using white LED light. 4x Nikon Plan Apo NA 0.20 objective. Olympus Aplanat Achromat condenser, brightfield. 2.5x Nikon CF PL photoeyepiece. Canon EOS 5DSR camera. Single unstacked image. RAW file processed in Darktable before final editing in Photoshop. Some chromatic aberration visible (my system is better suited to monochrome light and higher magnifications).