Canon EF 24-105 mm f/3.5-5.6 IS STM
8. Vignetting
| Canon 50D, 24 mm, f/3.5 | Canon 50D, 24 mm, f/4.0 |
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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/5.6 | Canon 50D, 70 mm, f/8.0 |
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| Canon 50D, 105 mm, f/5.6 | Canon 50D, 105 mm, f/8.0 |
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The vignetting is hardly bothersome here and the biggest chances to see it you get at the combination of the shortest focal length and the maximum relative aperture, where it amounts to 20% (−0.65 EV). Applying the f/4.0 aperture so in fact stopping down the lens very slightly, makes the vignetting decrease to an almost imperceptible level of 11% (−0.35 EV).
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Even less problems you’ll experience at the 40 mm focal length where, even with the lens wide open, the vignetting reaches just 14% (-0.43 EV). It becomes negligible on stopping down to f/5.6, as it decreases to 6% (−0.18 EV).
The performance at the 70 mm focal length is very similar: by f/5.6 and f/8.0 the brightness loss in the frame corners amounts to, respectively 12% (−0.36 EV) and −0.16 EV (5%). What’s more, almost exactly the same values you get at the maximum focal length. By f/5.6 and f/8.0 the vignetting reaches 11% (−0.35 EV) and 5% (−0.15 EV).
Now let’s check how the lens fares on full frame of the Canon 5D Mark III.
| Canon 5D MkIII, 24 mm, f/3.5 | 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/5.6 | Canon 5D MkIII, 70 mm, f/8.0 |
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| Canon 5D MkIII, 105 mm, f/5.6 | Canon 5D MkIII, 105 mm, f/8.0 |
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There are far more problems here and they are the most painful at the shortest focal length - at the maximum relative aperture the light fall-off gets to 57% (−2.42 EV), a very high level indeed. On stopping down to f/4.0 that aberration decreases to 50% (−2.02 EV), and by employing the f/5.6 aperture you can reduce it to 35% (−1.26 EV). Even the f/8.0 aperture won’t allow you to enjoy vignetting-free images because its level is still 30% (−1.02 EV) there. In fact that aberration remains visible also after a very significant stopping down of the lens to f/11 and f/16, where we got the following results: 25% (−0.83 EV) and 21% (−0.69 EV).
The situation improves significantly when you pass to the 40 mm focal length. At the maximum relative aperture you must take into account the brightness loss on a level of 29% (−0.99 EV). After stopping down to f/5.6 the vignetting decreases to an almost imperceptible level of 11% (−0.34 EV).
Even less problems you’ll see at 70 mm. At the maximum relative aperture the vignetting is 23% (−0.75 EV) and it decreases to an imperceptible value of 8% (−0.25 EV) on stopping down to f/8.0.
Also at the maximum focal length there are no serious reasons to complain as by f/5.6 the vignetting reaches 30% (−1.04 EV) and it decreases to 15% (−0.48 EV) on stopping down to f/8.0. You can eliminate the vignetting completely only after employing f/11, where that aberration is just 9% (−0.28 EV).
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