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
After the runaway success of the full-frame 35mm f/1.4, Sigma is taking the initiative with this new ultra-high speed, pro-level standard zoom designed for APS-C format cameras. The specification is particularly promising, but does it mean the end of fixed focal lenses for APS-C? Read on to see how well this cutting-edge model performs in our labs.
As with the 35mm prime, this new model is one of the firm’s new Art series lenses challenging Canon’s L-series and the similar ED lenses from Nikon for optical quality.
At first blush it could be mistaken for a full-frame lens but it is in fact designed for APS-C format DSLRs and has the equivalent angle of view of a 29-56mm zoom on a Canon EOS 700D or similar body.
It stands out for its constant f/1.8 maximum aperture, which is the fastest zoom made for DSLRs currently (that accolade previously went to Olympus for their phenomenal Zuiko Digital ED 14-35mm and 35-100mm f/2.0 zooms), and features no less than 17 elements in 12 groups. Of those, five are low dispersion glass types and four elements feature aspherical surfaces. In all, the lens weighs a fairly significant 810g (28.6 oz.) but it has an ultrasonic type AF motor, focuses to 28cm and has a sticker price of a not unreasonable $799.