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 |
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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.
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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 |
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| A7R II, FF, f/5.6 | A7R II, FF, f/8.0 |
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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 |
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