Sigma A 28 mm f/1.4 DG HSM review - Vignetting

Have you rated your lenses yet?

Sigma A 28 mm f/1.4 DG HSM

21 January 2019

Arkadiusz Olech

8. Vignetting

First let’s check how the Sigma A 1.4/28 performs in this category on the smaller sensor of the Canon 50D – appropriate thumbnails you can find below.

Canon 50D, f/1.4	Canon 50D, f/2.0

No reasons to worry– at the maximum relative aperture the vignetting amounts to 27% (−0.89 EV), and by f/2.0 and f/2.8 it decreases to an imperceptible value, 9% (−0.28 EV) and 7% (−0.22 EV) respectively.

Please Support Us

If you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio; only that way we will be able to continue providing you interesting content for free.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Now let’s check how the situation changes when you progress to full frame – below you can find images produced with the help of the Canon EOS 5D Mark III.

Canon 5D III, f/1.4	Canon 5D III, f/2.0

Canon 5D III, f/2.8	Canon 5D III, f/4.0

In this case vignetting is, unfortunately, huge. At the maximum relative aperture you lose as much as 64% of light (−2.94 EV) in frame corners. What’s interesting, it is a result better than 68% achieved by the bigger Otus. Both the Sigma and the Otus are weaker in this category than the Nikkor AF-S 1.4/28 as its result was 53%.

Fortunately the vignetting of the Sigma decreases swiftly on stopping down. By f/2.0 its value is 40% (−1.49 EV), and by f/2.8 it reaches 21% (−0.68 EV). By f/4.0 the light fall-off drops to an almost imperceptible value of 12% (−0.38 EV) and then it stops reacting to further stopping down of the aperture.

Canon 5D III, JPEG, f/1.4