Canon EF 24-105 mm f/4L IS II USM
8. Vignetting
| Canon 50D, 24 mm, f/4.0 | Canon 50D, 24 mm, f/5.6 |
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| Canon 50D, 40 mm, f/4.0 | Canon 50D, 40 mm, f/5.6 |
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| Canon 50D, 70 mm, f/4.0 | Canon 50D, 70 mm, f/5.6 |
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| Canon 50D, 105 mm, f/4.0 | Canon 50D, 105 mm, f/5.6 |
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It is clear that there are no problems whatsoever. Only at the maximum relative aperture you might get a chance to notice any vignetting at all – in that case at 24, 40, 70 and 105 mm we got respectively 13% (−0.41 EV), 13% (−0.42 EV), 15% (−0.48 EV) and 16% (−0.51 EV). On stopping down the aperture to f/5.6 you see the vignetting decrease to an imperceptible level of 7–10%.
Now let’s see how the situation changes on a much more demanding full frame – below we present photos shot with the lens attached to the Canon EOS 5D Mark III.
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| Canon 5D MkIII, 24 mm, f/4.0 | Canon 5D MkIII, 24 mm, f/5.6 |
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| Canon 5D MkIII, 40 mm, f/4.0 | Canon 5D MkIII, 40 mm, f/5.6 |
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| Canon 5D MkIII, 70 mm, f/4.0 | Canon 5D MkIII, 70 mm, f/5.6 |
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| Canon 5D MkIII, 105 mm, f/4.0 | Canon 5D MkIII, 105 mm, f/5.6 |
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At a difficult combination of wide angle and f/4.0 you lose 47% (−1.86 EV) of light in the frame corners. It is a lot but that result still remains better than that of the Sigma 24-105 mm OS and the Canon 24-105 mm STM. What’s interesting, it is exactly the same value as in the case of the Canon EF 24-70 mm f/4L IS USM; mind you its task was easier because of a narrower range of focal lengths. Overall, in this category the tested lens compares favourably to its rivals.
After stopping down the aperture to f/5.6 the vignetting decreases to 33% (−1.14 EV). By f/8.0 and f/11.0 relative apertures we got respectively 25% (−0.84 EV) and 22% (−0.70 EV). Further stopping down didn’t have any measureable influence on vignetting.
At 40 mm focal length the vignetting was lower than at 24 mm and by the maximum relative aperture it amounted to 34% (−1.18 EV); then it decreased to 18% (−0.59 EV) on stopping down the aperture to f/5.6. Another stopping down by 1 EV meant a lower brightness loss in the frame corners amounting to 14% (−0.43 EV).
A slight increase of vignetting level can be observed at the longer end of the focal lengths spectrum. At 70 mm and by f/4.0 that aberration reached 42% (−1.56 EV); then it decreased to 23% (−0.75 EV) and 12% (−0.38 EV) by f/5.6 and f/8.0. At a combination of 105 mm and f/4.0 aperture we got 41% (−1.54 EV); that level decreased to 22% (−0.72 EV) by f/5.6 and to 10% (−0.31 EV) by f/8.0.
Even though the vignetting levels at longer focal lengths can be hardly called low, the tested Canon still fared better than the rival Sigma.
| Canon 5D Mk III, 24 mm, f/4.0 |
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| Canon 5D Mk III, 40 mm, f/4.0 |
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| Canon 5D Mk III, 70 mm, f/4.0 |
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| Canon 5D Mk III, 105 mm, f/4.0 |
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