Introduction With a sweeping 74 to 29 degrees horizontal angle of view, this $750 full-frame ultra-wide zoom is an update to the compact yet film-era D-series model of the same focal range and focal ratio. As a G-series lens it will come as no surprise to learn the aperture ring is now controlled electronically from the camera. Internally, improvements to the optical design include two ED glass- and three aspherical-elements (up from one of each previously) bringing the total to 12 elements in eight groups. This lens also has an ultrasonic type AF motor (SWM in