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Lens review

Canon EF 24 mm f/2.8 IS USM

17 October 2012
Szymon Starczewski

8. Vignetting

With a bit of goodwill you can consider the vignetting on the Canon’s 50D sensor to be moderate. The thumbnails below show it very well.

Canon EF 24 mm f/2.8 IS USM - Vignetting


At the maximum relative aperture the brightness loss in the frame corners amounts to 29% (-0.98 EV). The problem becomes marginal already by f/4.0 because the vignetting decreases there to 11% (-0.33 EV). Further stopping down influences the value of this aberration only very slightly.

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Let’s progress to the performance on full frame now.

Canon EF 24 mm f/2.8 IS USM - Vignetting


It would be difficult not to notice that the vignetting at the maximum relative aperture is huge. The result we got is 62% (-2.76 EV). Taking into account an average fastness of this lens such a result is really weak. By f/4.0 the vignetting is also high reaching 39% (-1.45 EV) there. A moderate level of that aberration is only achieved by f/5.6 where our measurements showed 26% (-0.87 EV). On further stopping down you can’t make the vignetting decrease by more than 1%.

Canon EF 24 mm f/2.8 IS USM - Vignetting