Sigma’s 20mm F2 DG DN is a small lens with a big punch

If you own an L-mount or Sony E camera then the good news is that you’ve got yet another impressive lens to add to your kit bag and this is because Sigma has just launched the 20mm F2 DG DN, which sits within the brand’s I Series of small, but powerful optics.

Image taken with Sigma 20mm F2 DG DN by Jim Keopnick / Sigma

Despite offering a ultra-fast maximum aperture of f/2, the 20mm F2 DG DN lens tips the scales at just 370g and measures only 72mm in length, making it ideal to pair with smaller full-frame mirrorless models such as the Sony a7C and the Sigma fp L. A lighter lens means the pairing is less likely to be ‘front heavy’, leading to a more comfortable hold.

With a versatile focal length of 20mm, the lens can be used for a wide range of photographic tasks; from landscape and architecture work, right through to street photography and wider-angle portraiture. When used on a crop-sensor camera like the Sony a6600, that focal length switches up to 30mm.

Image taken with Sigma 20mm F2 DG DN by Jack Fusco / Sigma

Built around a ‘13 elements in 11 groups’ construction, the lens features no less than three aspherical elements and is compatible with high-speed autofocus systems thanks to the stepping motor – for example, the lens supports Sony’s DMF focus mode.

Image taken with Sigma 20mm F2 DG DN by Shinich Hanawa / Sigma

An aperture ring near the base of the barrel enables photographers to change their f-stop with the twist of the writs and that same aperture ring will also enable videographers to seamlessly adjust the aperture during a movie sequence to balance the exposure level – further widening this lens’ appeal to video shooters.

Image taken with Sigma 20mm F2 DG DN by Joe Koepnick / Sigma

A nine-blade rounded diaphragm will deliver that impressive bokeh and the lens is resistant to dust and moisture. What’s more, the 20MM F2 is future-proof, thanks to the compatibility with Sigma’s USB Dock system that will enable firmware updates to be downloaded to the lens. 

Image taken with Sigma 20mm F2 DG DN by Kim Jenssen / Sigma

Other features include a petal-type lens hood, Multi-Layer Coating on the elements, a filter thread size of 62mm and a minimum focusing distance of just 22cm, which enable photographers to make more of the foreground interest in their scenes or fill the frame with smaller subjects.

Image taken with Sigma 20mm F2 DG DN by Adam Klingeteg / Sigma