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Get information and user reviews for this lens from Amazon: Sigma 120-300mm f/2.8 EX DG IF HSM APO Telephoto Zoom Lens for Nikon SLR Cameras
The Sigma 120-300mm f/2.8 EX DG HSM Lens is unique in it’s capabilities – at this time, no other Canon-mount zoom lens can maintain an action-stopping f/2.8 aperture beyond 200mm. This lens has action-sports written all over it. Unfortunately, the Sigma 120-300mm f/2.8 EX DG HSM Lens has a significant shortcoming that affects action sports photography – Autofocus can’t keep up with action rapidly moving toward or away from the camera. Image quality from the Sigma 120-300mm f/2.8 EX DG HSM Lens is decent. It has decent sharpness wide open and gets really nice stopped down a stop or so. Sports photography is the primary market for the Sigma 120-300mm f/2.8 EX DG HSM Lens, but there are other good uses for it. … Basically, any requirement met by the 120-300mm focal length range with a fast aperture and not-extremely fast AF where size and weight are not an issue can be met. Though not a cheap lens, it is a decent value. READ FULL REVIEW