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Message: <blockquote data-quote="Peter7100" data-source="post: 769654" data-attributes="member: 48633">Yes and no would be my answer. I find if I shoot a fast subject moving in a straight line then it works fine (see post below). However if there is any erratic movement, eg BIF then that is a different story.I can rule out camera/user error as I am able to grab focus and track with my Nikon 300mm prime without any issues, but can't say the same for using the Sigma at 300mm.Of course using a zoom at 600mm then that is a challenge in itself to track a moving object but I still believe there is a minor lag in nailing focus with this lens. I think erratic movement then causes this to be more noticeable.I still think the Sigma 150-600 c is great value though.</blockquote>