Reviews and Problems with Canon EF 17-40mm f/4L USM
Showing 1-5 of 5
Canon EF 17-40mm f/4L USM lens, (tested with cropped-frame APS-C body)
1 July 2007
Summary: The Canon EF 17-40mm may deliver spectacular ultra-wide angle coverage when fitted to a full-frame body like the EOS 5D, but offers a more normal, general-purpose range when mounted on cropped bodies like the EOS 30D or 400D / XTi.
Pros: Canon 'L' build and optical quality, Fast and quiet USM focusing motor, Constant f4 aperture throughout range, Will also work on full-frame body
Cons: Shorter zoom range than kit lens, No IS (although not particularly necessary), Overkill if not considering full-frame in future, Canon EF-S 17-85mm more flexible for most
Summary: Canon EF 17-40mm verdict
The EF 17-40mm f/4.0L is one of the best lenses in Canon’s range. It brings you a taste of the truly exotic with ultra-wide coverage, while boasting ‘L’ quality all at a surprisingly affordable price.
Pros: Extreme wide angle coverage, Well-corrected at wider focal lengths, Fast and quiet USM focusing motor, An exotic but affordable 'L' lens
Cons: Zoom range too limited for general purpose, Soft corners at 40mm focused at infinity, Unimpressive macro capabilities, Light fall-off at wide angle (but expected)
Canon EF 17-40mm f/4 USM L (full format) - Review / Test Report
31 August 2008
Conclusion: It's not exactly easy to design a flawless full format lens and the Canon EF 17-40mm f/4 USM L shows its part of the struggles here. The lens is not overly fast but it has a comparatively broad range for a lens in this class and it seems as if Canon has overstretched things a little with respect to...
Conclusion: The Canon EF 17-40mm f/4 USM L is a very good performer without a significant weakness. It's generally very sharp and contrasty across the image field. Vignetting is very well controlled - at least when using it on an APS-C DSLR.