The Sigma 28-70mm F2.8 DG DN Contemporary ($899) is a relatively compact zoom lens for full-frame cameras. It’s smaller and less expensive than more common 24-70mm F2.8 optics, adding appeal for photographers working on a budget or with a desire to use a lighter kit. It costs a bit more, and has a little less zoom power, than the Tamron 28-75mm F2.8 Di III RXD.
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