LensTip.com

Lens review

Canon EF 28 mm f/2.8 IS USM

25 October 2012
Arkadiusz Olech

8. Vignetting

On the small sensor of the Canon 50D the vignetting, even at the maximum relative aperture, we can consider as moderate. You can see it in thumbnails, presented below.

Canon EF 28 mm f/2.8 IS USM - 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.

Canon EF 28 mm f/2.8 IS USM - Vignetting


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%!

Canon EF 28 mm f/2.8 IS USM - Vignetting