Canon EF 24 mm f/2.8 IS USM
8. 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.
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%.
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