A beautiful arrangement of various diatoms by Watson and Sons Ltd. Coverslip cracked, coverslip ring damaged, and mountant yellowed. Some diatom movement. 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).