Canon EF 28 mm f/2.8 IS USM
8. Vignetting
In the case of f/2.8 aperture you should take into account the fact that the brightness loss in the frame corners will amount to 27% (-0.90 EV). However it is very comforting that already by f/4.0 the vignetting decreases to a not bothersome value of 10% (-0.29 EV).
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Serious problems start on full frame and the photos below show them well.
At the maximum relative aperture the light fall-off in the frame corners gets to 56% (-2.47 EV) which is a very high result. Also by f/4.0 the vignetting seems to be a very serious problem as it is 35% (-1.23 EV) there. A moderate level of that aberration (but one that still can be called bothersome) we observe only by f/5.6 where we got a result of 24% (-0.78 EV). On further stopping down you see no efficient correction of the vignetting – by f/8.0 it amounts to 22% (-0.72 EV) and by higher aperture it doesn’t decrease at all.
The problems of the Canon 2.8/28 IS are especially acute if you compare them to the performance of its older 1.8/28 brother. Despite the fact that the new lens is much slower the vignetting at maximum aperture is better in the case of the older device exactly! By f/2.8 the older model loses just 28% of light so it is better than its successor by almost 30%!
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