LensTip.com

Lens review

Sigma C 65 mm f/2 DG DN

27 February 2021
Maciej Latałło

8. Vignetting

First, let's check vignetting levels for the smaller APS-C sensor – appropriate thumbnails you can find below.

A7R II, APS-C, f/2.0 A7R II, APS-C, f/2.8
Sigma C 65 mm f/2 DG DN - Vignetting Sigma C 65 mm f/2 DG DN - Vignetting


In this case some chances to notice vignetting you get only at the maximum relative aperture where its level amounts to 19% (−0.62 EV). By f/2.8 it decreases to a practically imperceptible value of 7% (−0.20 EV).


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After passing to the bigger, full frame sensor there are a bit more problems and you can see them very well in photos below.

A7R II, FF, f/2.0 A7R II, FF, f/2.8
Sigma C 65 mm f/2 DG DN - Vignetting Sigma C 65 mm f/2 DG DN - Vignetting
A7R II, FF, f/4.0 A7R II, FF, f/5.6
Sigma C 65 mm f/2 DG DN - Vignetting Sigma C 65 mm f/2 DG DN - Vignetting


At the maximum relative aperture we got a result reaching a high level of 51% (−2.08 EV). What's interesting, when compared to its direct rivals, the Sigma actually fares pretty well. The Voigtlander Apo-Lanthar 65 mm f/2 Aspherical 1:2 Macro, mentioned already in this test, a lens of siginifcant physical dimensions, had a result of 54%; the Sony Carl Zeiss Sonnar T* FE 55 mm f/1.8 ZA by f/1.8 could reach even 59% and on stopping down its aperture to f/2.0 the result of 53% still was weaker than that the Sigma .

Stopping down the aperture of the tested Sigma is quite effective when it comes to vignetting reduction because by f/2.8 you can decrease its level to 27% (−0.91 EV), and by f/4.0 that aberration becomes not especially bothersome, dropping to just 16% (−0.51 EV). Further stopping down doesn't have any measurable effect on the aberration, described in this chapter.

Sony A7R III, JPEG, f/2.0
Sigma C 65 mm f/2 DG DN - Vignetting