Three years ago, Sigma provoked genuine excitement amongst photographers by developing the world’s first APS-C zoom with a maximum aperture of f/1.8 across its focal range. The Sigma 18-35mm f/1.8 DC HSM became a sought-after lens by those who fancied a fast wideangle to standard focal length lens at an attractive price, the only caveat with its design being that its use is strictly confined to those using APS-C sensor cameras. At the time of its release, there were suggestions that the lens might be the first in a series of fast f/1.8 zoom lenses from Sigma, but as the years rolled by it seemed like the 18-35mm f/1.8 DC HSM may have been a one off.Not content with just the one optic in the Global Vision Art series of fast-aperture lenses, Sigma’s engineers have burnt the midnight oil and produced their second f/1.8 zoom, which was showcased for the first time at the CP+ show in Japan earlier this year. Ever since wraps first came off the Sigma 50-100mm f/1.8 DC HSM A we’ve been eagerly waiting to lay our hands on a review sample to find out how well it performs at covering the focal lengths of three popular prime lenses and whether it’s another lens APS-C DSLR users should be adding to their wish list.
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