The Tamron 17-70mm f/2.8 Di III-A VC RXD is a fast standard zoom for Sony E-mount and Fujifilm X-mount APS-C mirrorless cameras. It covers a 25.5-105mm full-frame equivalent range at a constant f/2.8, with Vibration Compensation, a quiet RXD focus motor and moisture-resistant construction. That combination of range and speed has no direct rival among APS-C standard zooms, which usually stop at f/4 or reach f/2.8 only over a shorter range. It suits photographers who want one walk-around lens for people, travel and low light, and it is heavier and larger than the kit zooms it replaces.
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Owners and reviewers rate the lens highly for sharpness, the constant f/2.8 aperture and the useful 17-70mm range. Common complaints are its size and weight and the lack of an aperture ring.
The Tamron 17-70mm F/2.8 Di III-A VC RXD (Model B070) is a standard zoom lens for APS-C mirrorless cameras. It covers 17-70mm, which is 25.5-105mm in full-frame equivalent, a 4.1x zoom ratio. The maximum aperture stays at F2.8 across the whole zoom range.
The optical formula has 16 elements in 12 groups, including two GM (Glass Molded Aspherical) elements and one aspherical hybrid element. The design aims for high resolution and contrast in the center, corners and edges of the image. The lens has Moisture-Resistant Construction and a Fluorine Coating. Its Ø67mm filter size matches Tamron's full-frame mirrorless lenses.
Tamron's VC (Vibration Compensation) reduces the effect of camera shake when shooting handheld at slow shutter speeds. In video, AI-based stabilization adjusts compensation to the shooting situation. The lens focuses as close as 0.19 m (7.5 in) at the wide end and 0.39 m (15.4 in) at the telephoto end.
