Navicula clavata from Mindora [Mindoro] Sea, Philippine Islands. 2 examples on the slide. Prepared by WA Firth. 63x Leitz Pl Apo NA 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 20 images stacked in Zerene (Pmax).