Canon EF 28-105MM F/3.5 - 4.5 USM Autofocus Lens Lens Construction - 12 Groups / 15 Elements including 1 aspherical element Diagonal Angle Of View - 75 - 23 20' Focus Adjustment - Inner focusing system with USM Closest Focusing Distance - 0.48m / 1.57 feet Zoom System - Rotating type