Reviews and Problems with Canon EF 100-400mm f/4.5-5.6L IS USM
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Value for money 8
Overall quality 7
Build quality 8
Canon EF 100-400mm f/4.5-5.6 USM L IS - Full Format Review / Test Report
8 November 2008
Conclusion: The Canon EF 100-400mm f/4.5-5.6 USM L IS is almost a boring lens but in a positive sense. It shows no extreme weaknesses nor strengths. You will find sharper lenses - primes that is - but it is very sharp for a zoom lens, especially considering its 400mm, and that's throughout the range at all relevant aperture settings. As such it is e.g.
Canon EF 100-400mm f/4.5-5.6 USM L IS - Review / Test Report
21 May 2008
Conclusion: The Canon EF 100-400mm f/4.5-5.6 USM L IS is a very good performer with few weaknesses ... that's assuming you get a good sample - the first tested sample was mediocre whereas the second one performed very fine. The resolution of the lens is on a very high level throughout the zoom range with only a marginal performance penalty at 400mm. Vignetting, distortions and CAs aren't really field relevant on an APS-C DSLR.