Canon EF-S 24 mm f/2.8 STM review - Vignetting

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Canon EF-S 24 mm f/2.8 STM

6 May 2015

Arkadiusz Olech

8. Vignetting

If I had to choose a category where a “pancake” lens is most likely to encounter serious problems I would place my bet on the vignetting without hesitation. Small dimensions of the instrument along with a wide angle of view sound like a perfect recipe for a disaster.

Let’s check how the Canon EF-S 24 mm f/2.8 STM managed to perform in this category.

Canon 50D, f/2.8	Canon 50D, f/4.0

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According to our expectations the vignetting level is seriously high but still you can’t call it huge. At the maximum relative aperture you have to take into account a loss of 42% (−1.56 EV) in the frame corners. On stopping down to f/4.0 you can decrease that aberration’s level to 19% (−0.63 EV) so it becomes moderate. An almost complete disappearance of the vignetting problems can be achieved by f/5.6 and f/8.0 where the vignetting amounts to, respectively, 11% (−0.33 EV) and 10% (−0.31 EV).