Sigma A 105 mm f/2.8 DG DN Macro
8. Vignetting
A7R II, APS-C, f/2.8 | A7R II, APS-C, f/4.0 |
![]() |
![]() |
You don't notice almost any problems at this place. Even at the maximum relative aperture vignetting is difficult to notice as it reaches just 18% (-0.58 EV) and then it decreases to a completely imperceptible value of 8% (-0.24 EV) on stopping down the aperture to f/4.0.
Please Support UsThe 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. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
How does the situation look on full frame? Appropriate thumbnails you can find below.
A7R II, FF, f/2.8 | A7R II, FF, f/4.0 |
![]() |
![]() |
A7R II, FF, f/5.6 | A7R II, FF, f/8.0 |
![]() |
![]() |
Looking at the narrow barrel of the tested lens and truncated circles of light in frame corners from the previous chapter we expected here a lot of problems. However, the Sigma managed to surprise us very nicely. By f/2.8 brightness loss in frame corners amounts to 36% (-1.28 EV). It is a value easy to spot but Sony FE lenses made us used to results of 2-3 EV in this category so, overall, the Sigma doesn't perform so badly. It's worth reminding here that the rival Sony 2.8/90 showed here a level of 53%.
Stopping down the lens to f/4.0 is able to decrease vignetting to 29% (-0.98 EV), and applying the f/5.6 relative aperture makes that aberration drop even further to 24% (-0.81 EV). The decrease of vignetting on stopping down is really steep - our measurements by f/8.0 and f/11.0 showed, respectively, 20% (-0.64 EV) and 14% (-0.44 EV). Only after applying f/16.0 you might get rid of vignetting, with a quite symbolic result of 8% (-0.26 EV).
Sony A7R II, JPEG, f/2.8 |
![]() |