The SLR Hut Sigma 24-105mm f/4 DG OS HSM Lens is a wide-angle to medium telephoto zoom lens with constant f/4 aperture. Designed for both full-frame and crop sensor Nikon 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 distortion throughout the zoom range, as well as providing greater image sharpness while avoiding reduced peripheral brightness. Super multi-layer coating has also been applied to lens elements to reduce surface reflection, lens flare, and ghosting to produce images with high contrast and color fidelity.