Sigma A 20 mm f/1.4 DG DN review - Introduction

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Sigma A 20 mm f/1.4 DG DN

5 October 2022

Maciej Latałło

1. Introduction

Full frame 20 mm lenses have been present on the market for many years; still, more often than not, they offered aperture fastness of f/2.8 or close. The era of faster instruments of that class started only near the very end of the 20th century - in December 2000 the Japanese Sigma company showed the 20 mm f/1.8 EX DG ASPHERICAL RF.

Another serious step forward in this class of equipment happened in September 2008 when Leica presented the Summilux-M 21 mm f/1.4 ASPH lens. Its aperture fastness is better but the focal lenght also a bit longer so the bar was set a tad lower. After all, a reduction of the focal lenght by 1 mm makes the field of view narrower by almost three degrees.

We had to wait for the answer of Sigma till 2015, when the reflex camera A 20 mm f/1.4 DG HSM model was released.

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Sigma A 20 mm f/1.4 DG DN - Introduction

For some time they have been offering that model also as a mirrorless variant without changing its optical construction; it was enough you added an integral extention with an appropriate mount.

A launch of a device completely dedicated for a mirrorless system had to wait till 8th August 2022 – on that day Sigma showed two very fast wide angle lenses, the 1.4/20 and the 1.4/24.

Courtesy of K-Consult, the official Sigma products distributor for Poland, we got one specimen of the new Sigma A 20 mm f/1.4 DG DN lens very quickly and today we are able to present its full test – enjoy your lecture!

You are also invited to get acquainted with our test procedure, described in the article "How do we test lenses?" If you feel it’s still not enough, please go to our FAQ section where you can find some further explanation.