The Sigma 18-35mm F1.8 DC HSM was announced to widespread excitement, if only for the company's sheer ambition in making such a fast zoom. But this inevitably came with a degree of scepticism - it's hard enough to make an F2.8 zoom that's really sharp wide open, so could an F1.8 zoom possibly work?
Super fast constant F1.8 maximum aperture; Excellent optics; even wide open; Fast; silent autofocus; Solid build quality without being over-heavy; Compatible with Sigma's USB dock and Optimization Pro software
Restricted zoom range; Needs detailed AF microadjustment for best results; Inconsistent autofocus in difficult conditions even after microadjustment; Physically rather large for a standard zoom