Sigma C 30 mm f/1.4 DC DN review - Vignetting

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Sigma C 30 mm f/1.4 DC DN

14 June 2016

Arkadiusz Olech

8. Vignetting

Let’s look at thumbnails presented below – they will allow you to assess the vignetting performance of the tested lens for JPEG files.

Olympus E-PL1, f/1.4	Olympus E-PL1, f/2.0

At the maximum relative aperture the brightness loss in frame corners amounts to 38% (−1.39 EV). That value can be hardly called low especially if you take into account the fact that the Sigma was designed to cooperate with APS-C/DX sensors. On the other hand it still remains by 11% lower than the vignetting of the Panaleica 1.4/25.

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Fortunately the vignetting decreases very quickly on stopping down. By f/2.0 you get to 16% (−0.51 EV), and by f/2.8 its level becomes imperceptible (7% and −0.22 EV).

In the case of RAW files the results are very similar, not differing from the values we got for JPEG files by more than 2–3%.