25 form circle arrangement, exhibition mount. Prepared by Klaus Kemp. Mounted in Styrax, dated February 1994. One of the diatoms has moved slightly. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Leitz Heine condenser, set to just into dark ground. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 12 images stacked in Zerene (Dmap).