LensTip.com

Lens review

Sigma C 56 mm f/1.4 DC DN

22 December 2018
Arkadiusz Olech

8. Vignetting

Let’s check the vignetting performance with the tested lens while attached to the Sony A7R II working in the APS-C mode.

Sony A7R II, APS-C, f/1.4 Sony A7R II, APS-C, f/2.0
Sigma C 56 mm f/1.4 DC DN - Vignetting Sigma C 56 mm f/1.4 DC DN - Vignetting
Sony A7R II, APS-C, f/2.8 Sony A7R II, APS-C, f/4.0
Sigma C 56 mm f/1.4 DC DN - Vignetting Sigma C 56 mm f/1.4 DC DN - Vignetting


In the case of this type of detector there are no differences between RAW and JPEG formats. At the maximum relative aperture the brightness loss in the frame corners amounted to 48% (−1.89 EV). It is a high value, influenced by small physical dimensions of the lens. On stopping down the aperture to f/2.0 you can decrease the vignetting level to 31% (−1.08 EV). By f/2.8 it still gets to 25% (−0.83 EV), and by f/4.0 it reaches 19% (−0.60 EV). The problems with this aberration end completely by f/5.6 and f/8.0 where we got, respectively,14% (−0.43 EV) and 13% (−0.41 EV).

Having the full frame Sony A7R II camera at our disposal we could also check the image circle of the tested Sigma and whether it covers full frame. It doesn’t and thumbnails below show it also lacks a lot.


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

A7R II, FF, f/1.4 A7R II, FF, f/8.0
Sigma C 56 mm f/1.4 DC DN - Vignetting Sigma C 56 mm f/1.4 DC DN - Vignetting

Sony A7R II, APS-C, JPEG, f/1.4
Sigma C 56 mm f/1.4 DC DN - Vignetting