Sigma C 65 mm f/2 DG DN
8. Vignetting
| A7R II, APS-C, f/2.0 | A7R II, APS-C, f/2.8 |
|
|
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).
Please Support UsIf 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. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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 |
|
|
| A7R II, FF, f/4.0 | A7R II, FF, f/5.6 |
|
|
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 |
 |
