Sigma 18-35mm F1.8 DC HSM A Canon mount lens review: fixed focal length quality in a zoom?By Kevin Carter - Tuesday July 16 2013 Lens Review
With the introduction of this model, Sigma has the best performing zoom of its type. The DxOMark score of 25 points puts well ahead of both the full-frame Canon EF 24-70mm f/2.8 L II USM and the Tamron SP 24-70mm f/2.8 Di VC USD (though bear in mind those lenses become the equivalent to a 38-112mm on a Canon APS-C body).
As for sharpness, the new lens is on a par with the very best performers, matching the $1699 full-frame Tamron SP70-200mm f/2.8 Di VC USD and the firm’s $999 APS-C format 50-150mm (80-240mm equivalent) f/2.8 EX DC APO HSM model with a 15P-Mpix score on the Canon EOS 700D.
High-grade, high-speed standard APS-C format zooms compared:
Comparing the new Sigma to the firm’s nearest equivalent model, the $670 Sigma 17-50mm f/2.8 EX DC OS HSM and Canon’s $1,180 EF-S 17-55mm f/2.8 IS USM,the high DxOMark Score is appreciably higher, as we’ve seen from the rankings above. While both models have stabilization optics, individual metrics show the new Sigma is significantly sharper than either, has far better transmission (actually +1.66 stop faster than the older Sigma and +2 stops faster the Canon) and has comparable distortion, reasonably low vignetting and very low chromatic aberration.