Sigma 20mm F2 DG DN | C review

The Sigma 20mm F2 DG DN Contemporary lens is typically compact but big on quality

Sigma 20mm F2 DG DN | C
(Image: © Matthew Richards)

Digital Camera World Verdict

The latest in Sigma’s growing range of ‘I-series’ prime lenses for Sony E and Leica L mount mirrorless cameras, this is a typically compact and lightweight lens, despite featuring a robust, full-metal construction and a high-quality optical path. It combines intuitive handling with fast autofocus and impressive image quality, making it an ideal ultra-wide-angle lens for architectural interiors, sweeping landscapes, astrophotography and more besides.


  • +

    Compact but sturdy

  • +

    Metal barrel, hood and cap

  • +

    Aperture control ring


  • -

    No aperture ‘de-click’ facility

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    Noticeable distortion if uncorrected

  • -

    No focus distance scale

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The Sigma 20mm F2 DG DN | C joins a growing range of fairly fast primes for Sony E-mount and Leica L-mount cameras in Sigma’s I-series range, which includes the 35mm F2 DG DN | C and 65mm F2 DG DN | C. There are also 24mm F2 and 45mm F2.8 options in the line-up. The look and feel are virtually identical in each case, with the same ‘Contemporary’ design ethos seeking to deliver excellent performance from a compact and lightweight build.


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Matthew Richards

Matthew Richards is a photographer and journalist who has spent years using and reviewing all manner of photo gear. He is Digital Camera World's principal lens reviewer – and has tested more primes and zooms than most people have had hot dinners! 

His expertise with equipment doesn’t end there, though. He is also an encyclopedia  when it comes to all manner of cameras, camera holsters and bags, flashguns, tripods and heads, printers, papers and inks, and just about anything imaging-related. 

In an earlier life he was a broadcast engineer at the BBC, as well as a former editor of PC Guide.