SIGMA 18-50MM F2.8 DC DN|C

APS-C lens squeezes a quart into a pint pot

The Sigma 18-50mm F2.8 DC DN |C bucks a trend. Think constant aperture f/2.8 'trinity' zooms and you're probably thinking chunky, heavyweight lenses. This Sigma is a more compact proposition, designed for Sony E-mount and Leica L-mount APS-C format cameras. It's amazingly small and light for an f/2.8 zoom, even by APS-C standards. Even the price tag is refreshingly lightweight.

Top of the list of desirable features is the fast and constant f/2.8 aperture. Compared with most variable-aperture standard zooms, this enables quick shutter speeds in low-light conditions and a relatively tight depth of field.