SUMMARY
Julia Trotti tested the Tamron 17-70mm f/2.8 lens on APS-C mirrorless cameras, finding it fills a niche for fast, versatile zooms. The lens offers a 25-105mm equivalent focal range, ideal for portraits, events, and landscapes, with a constant f/2.8 aperture for background separation. While it exhibits vignetting and distortion at 17mm that require post-correction, and has technically "dirty" bokeh, chromatic aberration is minimal. The lens is available for Sony E, Fuji X, Nikon Z, and Canon RF mounts, with some mount-specific feature differences.
TAKEAWAYS
The Tamron 17-70mm f/2.8 provides a 25-105mm equivalent focal range on APS-C cameras.
It features a constant f/2.8 aperture for good background blur.
Vignetting and distortion are present at 17mm and require correction.
The lens is available for Sony E, Fuji X, Nikon Z, and Canon RF mounts.