The Tamron SP 24-70mm f/2.8 Di VC USD G2 has some big marks in its favor: a bright f/2.8 aperture throughout its zoom range, weather resistance and fluorine protection, a strong optical stabilization system, and a price that seriously undercuts first-party options.
Sharp results at f/2.8 at wider angles; Strong image stabilization system; Excellent build; Dust and splash protection; Available for Canon and Nikon SLRs; Low price
Image quality suffers beyond 50mm; Noticeably dim corners; Chromatic aberration at 24mm; Some visible distortion