Sigma has spent the last few years redefining what DSLR and mirrorless users should expect from third-party lenses, with many of its Art-series optics in particular released to laudatory reviews. Now, with many popular options ticked off, the company has stretched out to deliver a handful of more unusual options.
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https://www.techradar.com/reviews/sigma-40mm-f14-dg-hsm-or-art-review