These lenses are of a very high quality and especially developed for the Hasselblad XPan. Even though the XPan uses ordinary 35 mm film, it's not an ordinary 35 mm format that is projected by the lens in panorama mode. The image circle is much larger than from any ordinary 35 mm camera lens. The XPan lenses are actually medium format lenses, but with the compact external dimensions of ordinary 35 mm lenses. Bayonet fitting, F4 - F22, 6 components, 8 elements, focusing range 0.7 m - infinity, filter o 49 mm. The angle is comparable to a 25 mm lens in 35 mm camera terms when the camera is set at panorama format.