Oamaru arrangement, JA Ball

Oamaru arrangement

An arrangement of diatoms from Oamaru, New Zealand. Preparer, probably JA Ball (a member of the Quekett Microscopical Club). Mounted in Styrax and dated 1939. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo NA 0.45 objective. Olympus Aplanat Achromat condenser, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Two stacks prepared in Zerene (Pmax) and then combined in Photoshop.