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Lens review

Canon EF 17-40 mm f/4.0L USM

22 September 2007
Robert Olech

4. Image resolution

The picture resolution of the Canon’s 17-40 mm is high in the whole range of focal lengths and diaphragms. The results are very good, although not fantastic since in this category the Canon 17-55 mm IS USM, Tamron 17-50 mm or Sigma 18-50 mm are slightly better.

Canon EF 17-40 mm f/4.0L USM - Image resolution


The lens behavior at the edge of the frame is similar to the one in the middle of the frame. Even with the wide-open aperture and any of the focal lengths, the lens achieves a very good result of 30lpmm. In this category the Canon is better than all the Sigmas, the same as the Canon 17-55 mm, but still slightly weaker than the Tamron.

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Canon EF 17-40 mm f/4.0L USM - Image resolution


To sum it up, there are only two other lenses on the market, which could be a potential threat to our Canon. These are the Canon 17-55 IS USM and Tamron 17-50 f/2.8. Especially the Tamron, because of its lower price, is a strong competition.

Canon EF 17-40 mm f/4.0L USM - Image resolution