The Tamron 17-70mm F2.8 Di III-A VC RXD ($799.99) is an exciting lens for photographers using Sony’s APS-C camera system. It delivers the premium optics you expect from an F2.8 zoom, along with speedy focus and an all-weather build, for fewer dollars than Sony’s high-end E 16-55mm F2.8 G ($1,399.99). The 17-70mm skips on-lens controls, but does include optical stabilization.
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