The Rodenstock APO-Ronar 240mm f/9 is an apochromatic process lens with a 212mm image circle, covering 4x5in with limited movements. With a 49mm filter thread, the symmetrical Dialyte design is optimised for close-range reproduction work with flat field performance and minimal distortion. When stopped down, the image circle increases significantly, making it usable as a taking lens for landscape photography at a fraction of the weight of conventional designs.