Sigma S 500 mm f/4 DG OS HSM review - Vignetting

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Sigma S 500 mm f/4 DG OS HSM

5 September 2017

Arkadiusz Olech

8. Vignetting

First let’s check how the Sigma S 4/500 deals with vignetting on the smaller sensor of the Canon 50D – appropriate thumbnails you can find below.

Canon 50D, f/4.0	Canon 50D, f/5.6

There are some chances to notice that aberration but only at the maximum relative aperture, where it reaches 20% (−0.65 EV). On stopping down the aperture to f/5.6 it decreases to an imperceptible value of 6% (−0.19 EV).

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Now let’s check how the situation changes after passing to full frame.

Canon 5D III, f/4.0	Canon 5D III, f/5.6

The vignetting is much easier to notice. At the maximum relative aperture it reaches 34% (−1.20 EV), a value which we find a tad too high. For example the Canon 4/400 DO II had a noticeably lower result, that of 23%. Still the problems with vignetting of the Sigma concern only the maximum relative aperture because already by f/5/6 and f/8.0 the brightness loss is, respectively, 15% (−0.46 EV) and 8% (−0.23 EV).

Canon 5D MkIII, JPEG, f/4.0