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Sigma 20mm F2 DG Contemporary

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Specifications

BrandSigma
CategoryUltra-Wide Angle
Prime or ZoomPrime
Focus TypeAuto
Focal length (mm)20
Aperture (max)2
Filter Size (mm)62
Weight (g)370
Length (mm)72
Diameter (mm)70
Weather Sealed✔
Image Stabilization✘
Min. focus distance (m)0.22
Max. magnification0.18
Release Year2021
Release Price (USD)699
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Description and Reviews

Key Take-Aways:

The Sigma 20mm f/2 DG DN Contemporary is a compact 370g ultra-wide prime from the I-series, combining a bright f/2 aperture with an all-metal build and portability suited for everyday use. Professional reviews highlight its sharpness, attractive rendering, and strong control of coma for astrophotography, while noting some vignetting and chromatic aberration at wide apertures, and that it competes with faster or more specialized wide-angle options. As of Sep 14 2025, user sentiment is favorable, with many photographers appreciating its balance of portability and quality, especially for landscapes and astro work, though some prefer brighter f/1.4 or f/1.8 alternatives for maximum flexibility.

From Sigma:

DYNAMISM IN THE PALM OF YOUR HAND

Exceptional optical performance and superb build quality give photographers the joy of creating images – introducing the new ultra-wide Sigma 20mm F2 DG | Contemporary

This all-new full-frame premium compact prime for mirrorless systems is the latest addition to Sigma’s I series lineup, combining a bright maximum aperture of F2, an ultra-wide 20mm focal length and stunning optical performance. The lens boasts an exceptionally small form factor, weighing in at just 370g and measuring just 72.4mm in length*, which makes it a highly practical optic that is portable enough for everyday shooting. It’s ideal for landscapes, wide-angle portraits, weddings and interiors, and is particularly well-suited to astrophotography owing to its very well-controlled sagittal coma flare. It is the fourth I series lens with an F2 aperture, joining a 24mm, 35mm and 65mm, which together make a well-matched lens set for L-Mount and Sony E-mount users.

Remarkably, the 20mm F2 DG | Contemporary is almost identical in size and weight to the very compact Sigma 24mm F2 I series. A sleek, all metal design, with a signature I series magnetic lens cap, a manual aperture ring and exceptional production quality means using this lens is a highly intuitive and satisfying experience, making the photo-taking process even more enjoyable. This sharp and beautifully built I series prime, the Sigma 20mm F2 DG | Contemporary captures the essence of the I series, bringing a new level of user experience―the pleasure of owning and using a lens.

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