Irix 30 mm f/1.4
8. Vignetting
| Canon 60D, f/1.4 | Canon 60D, f/2.0 |
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No reasons to worry in this place: at the maximum relative aperture vignetting is 23% (−0.74 EV), by f/2.0 and f/2.8 it drops to imperceptible values, 9% (−0.27 EV) and 4% (−0.12 EV) respectively.
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How the situation changes when you pass to full frame? Let's find out – photos below were taken with the help of the Canon EOS 5D Mark III.
| Canon 5D III, f/1.4 | Canon 5D III, f/2.0 |
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| Canon 5D III, f/2.8 | Canon 5D III, f/4.0 |
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Here vignetting makes itself felt. At the maximum relative aperture it reaches a level as high as 64% (−2.99 EV), a really weak result taking into account physical dimensions of the lens. Of course you have to add that the Sigma A 1.4/28 had exactly the same result in this category and the Zeiss Otus 1.4/28 fared even weaker. Mind you, all these three lenses are really big, bulky instruments.
Fortunately the vignetting level decreases quickly on stopping down. By f/2.0 it reaches 43% (−1.62 EV), by f/2.8 it drops to 24% (−0.79 EV), and by f/4.0 it is just 16% (−0.50 EV). By f/5.6 aperture and higher you deal with vignetting levels of about 13% (−0.4 EV).
| Canon 5D III, JPEG, f/1.4 |
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