Canon EF 28-135 mm f/3.5-5.6 IS USM review - Vignetting

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Canon EF 28-135 mm f/3.5-5.6 IS USM

22 September 2007

Arkadiusz Olech

8. Vignetting

In this category the Canon, again, is taking advantage of its full frame design. However, the advantages are not that great since even using an APS-C the vignetting is clearly visible. The light fall off in the corners of the frame is the most problematic at 28 mm, with the open aperture reaching 24% (-0.79 the value of the diaphragm). Stopping down the lens to f/4.0 decreases the effect to 17% and then, while stopping it down some more, to an acceptable level of 10%.

Canon EF 28-135 mm f/3.5-5.6 IS USM - Vignetting

At the 50 mm focal length range and an open aperture of f/4.5 we noticed the 19% light fall off in the corners (-0.61 the value of the diaphragm). When we use the f/5.6 diaphragm we reduce the vignetting to the 8% level.

The situation is even better at the 85 mm focal length. At f/5.6 the light fall off values reach 15% (-048 the value of the diaphragm). When stopping the lens one value down, the problem decreases to 6%. The situation is almost the same at the 135 mm focal length. The vignetting at f/5.6 and f/8 reach is, respectively, 14% and 6%.

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In summary, the vignetting is not a problem at the 50 to 135 mm focal length ranges. We can encounter a slight difficulty at 28 mm and with an open aperture, which is kind of an unpleasant surprise. We expected vignetting of less than 20% from a lens designed for a full frame.