The 24-105mm f/4 DG OS HSM Lens from Sigma is a wide-angle to medium telephoto zoom lens with a constant f/4 aperture. It is designed for both full frame and crop sensor Canon DSLR cameras.
The lens integrates three aspherical elements into its construction as well as two SLD and two FLD glass elements to help minimize aberration, field curvature, and distortions throughout the zoom range as well as provide greater image sharpness while avoiding reduced peripheral brightness.
The lens is compatible with Sigma's USB Dock and Sigma Optimization Pro software for adjusting focus position, and updating its firmware to better suit your needs.