Canon EF 85 mm f/1.4L IS USM
8. Vignetting
| Canon 50D, f/1.4 | Canon 50D, f/2.0 |
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There are no reasons to worry. At the maximum relative aperture the vignetting amounts to 25% (−0.85 EV), and by f/2.0 it decreases to 10% (−0.29 EV). By f/2.8 that aberration becomes completely imperceptible reaching only 6% (−0.17 EV).
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Now let’s see how the situation changes after passing to full frame.
| Canon 5Ds, f/1.4 | Canon 5Ds, f/2.0 |
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| Canon 5Ds, f/2.8 | Canon 5Ds, f/4.0 |
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Here the vignetting is much easier to observe. At the maximum relative aperture it reaches 54% (−2.24 EV) – a value higher than 49% of brightness loss featured by the Sigma but also noticeably lower than the shameful 66% presented by the Milvus. Also by f/2.0 you won’t have any problem with noticing vignetting as it gets to 33% (−1.16 EV) at that point. A moderate level is obtained by f/2.8 where we got a result of 14% (−0.45 EV). The problem disappears practically completely by f/4.0 where the light fall-off is just 9% (−0.26 EV).
| Canon 5Ds, JPEG, f/1.4 |
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