Sigma A 105 mm f/1.4 DG HSM review - Vignetting

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Sigma A 105 mm f/1.4 DG HSM

10 July 2018

Arkadiusz Olech

8. Vignetting

First let’s check how the Sigma A 1.4/105 deals with vignetting on the smaller sensor of the Canon 50D – respective thumbnails you can find below.

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

No reasons to worry in that place. At the maximum relative aperture the vignetting amounts to 21% (−0.69 EV), and by f/2.0 it drops to an imperceptible value of 9% (−0.26 EV).

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

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

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

The vignetting is much easier to observe here. At the maximum relative aperture it reaches 47% (−1.85 EV), interestingly the same value as in the case of the much smaller Nikkor 1.4/105E. When you stop down the aperture to f/2.0 the vignetting of the Sigma drops to a moderate level of 25% (−0.82 EV), while in the case of the Nikkor that aberration kept a higher value of 30%. The light fall-off of the Sigma disappears almost completely by f/2.8 and f/4.0 where we got, respectively,11% (−0.32 EV) and 8% (−0.25 EV); the brightness loss of the Nikkor still reached 17 and 14% at the same place. Bigger physical dimensions of the Sigma help that instrument to correct the vignetting but only after the slightest stopping down.

Canon 5D III, JPEG, f/1.4