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Lens review

Canon EF-S 10-18 mm f/4.5-5.6 IS STM

15 July 2014
Szymon Starczewski

8. Vignetting

It is never easy to correct the vignetting in wide angle lenses. The thumbnails below show that the optics constructors of the Canon 10-18 mm had a lot of problems as well.

Canon EF-S 10-18 mm f/4.5-5.6 IS STM - 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%.

Canon EF-S 10-18 mm f/4.5-5.6 IS STM - Vignetting

Canon EF-S 10-18 mm f/4.5-5.6 IS STM - Vignetting

Canon EF-S 10-18 mm f/4.5-5.6 IS STM - Vignetting