The Sigma 56mm f/1.4 DC DN Contemporary is a fast telephoto prime lens designed for Sony E-mount and Micro Four Thirds mirrorless systems. It becomes the third 1.4 lens in the series, following the popular 30mm f/1.4 and 16mm f/1.4. With its 112mm coverage in Micro Four Thirds terms, it targets those in search of a fast yet affordable mid-telephoto prime for portraits, low-light work, travel and more.
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https://mirrorlesscomparison.com/micro-four-thirds-lenses/sigma-56mm-1-4-vs-olympus-75mm-1-8/