Canon EF-S 10-18 mm f/4.5-5.6 IS STM
8. Vignetting
The worst situation is at the most difficult combination of 10 mm focal length and f/4.5 aperture - you must take into account the loss of as much as 53% of light in the frame corners (-2.21 EV). Stopping down the aperture to f/5.6 helps a bit but still the result you get, 38% (-1.41 EV) can hardly be called low. Moderate vignetting levels you see only at higher aperture values: by f/8.0 it amounts to 28% (-0.94 EV), by f/11 it is 22% (-0.71 EV) and by f/16 it decreases to 20% (-0.63 EV).
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Even better performance the lens achieves at 14 mm focal length. At the maximum relative aperture we got a result of 37% (-1.34 EV), by f/5.6 the vignetting gets to 32% (-1.10 EV) and by f/8.0 it decreases to 16% (-0.50 EV). Further stopping down doesn’t have any measurable influence on this aberration.
At the maximum focal length you see another slight improvement: by f/5.6 the vignetting is 35% (-1.25 EV) and it drops to 16% (-0.51 EV) by f/8.0. By f/11 and f/16 it keeps the same level as by f/8.0.
In this category it is obvious the older and more expensive brother of the tested lens fares better. For instance at 10 mm focal length, with a faster f/3.5 aperture so facing a more difficult task, it was able to correct the vignetting more efficiently – its level was no higher than 47%.
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