Sigma 150-600mm f/5-6.3 Contemporary DG OS HSM Telephoto Lens: Get the shot you want by attaching this telephoto lens to your Canon full-frame SLR camera. With optical stabilization and a zoom lock switch, you'll get the performance and versatility you need to capture clear photos in a variety of settings. Plus, the lens features a water- and oil-repellent coating and a dust- and splash-resistant design.
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Just got this lens and it is a great lens. I shoot a lot of wildlife and this lens is perfect. It focus fast and the 600mm is a real place getting those close up shots. Very smooth to focus in and out. I researched this lens for about a year and the positive reviews have been right on. For the money it beats paying for a Cannon 600mm lens which is 11K plus.