Large circle arrangement from St Peters, Hungary, prepared by Watson and Sons. Approximately 3.3mm across. Olympus BHB microscope imaged using white LED light. Canon EOS 5DSR camera, auto white balance. 3.2x Zeiss Semiplan NA 0.10 objective, with no condenser. 2.5x Nikon CF PL photoeyepiece. Single image (no stacking).