In this category the Canon’s L-grade lens showed all the competitors where they really stand in comparison. The wide field of view lenses are very difficult to correct as far as lateral chromatic aberration is concerned. The designers of the Sigma 18-50 f/2.8 or Canon 17-85 IS USM painfully experienced this when the chromatic aberration in these two lenses was at a very high level. The situation is a bit better in the Tamron 17-50 mm and much better in the Sigma 17-70 mm and the Canon 17-55 mm. All these achievements look weak when we take a look at the Canon 17-40 mm results in this category. In its case the chromatic aberration is corrected at a very good or even fantastic level. A slight chromatic aberration is visible at the wide-open aperture and the 40 mm focal length. For the rest of the focal length range and diaphragm combinations the chromatic aberration is never higher than 0.06%, which is a great result.
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