Sigma 18-35mm f/1.8 DC HSM
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dpreview posted a first impression review of Sigma’s UFO (Unbelievable F-stop Object), the amazing Sigma 18-35mm f/1.8 DC. The lens delivers constant f/1.8 through the zoom range and is the first zoom lens for APS-C DSLRs with this property. As dpreview writes, the Sigma 18-35mm f/1.8 DC “offers APS-C DSLR users access to some of the depth-of-field and low light capabilities that full frame shooters get from their F2.8 zooms”.
Overall the Sigma seems extremely promising and I’ve been pretty pleased with the results[...] Its range means it’s unlikely to be the ‘one lens to rule them all’ for many people, but if I were an owner of an APS-C DSLR that I liked, this might help dispel the idea that APS-C is somehow just a stepping-stone to the quasi-mythically ‘optimal’ full-frame format (an idea Nikon and Canon have no incentive to challenge). The fact remains that APS-C is by far the most widely-used format in the DSLR era, and this lens could help strengthen the cost/size/flexibility proposition that it offers.
The updated sample pics gallery is here.
Product description (from B&H’s product page):