The Rodenstock APO-Sironar N 240mm f/5.6 is a telephoto lens for 4x5in format with a 350mm image circle, also covering 8x10in with moderate movements. At 780g with a 77mm filter thread, the apochromatic correction ensures sharp results. The 240mm focal length serves as a standard lens for 5x7in format and a moderate telephoto on 4x5in, equivalent to roughly a 70mm lens on 35mm format.