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Get information and user reviews for this lens from Amazon: Canon Zoom Telephoto EF 100-400mm f/4.5-5.6L IS (Image Stabilizer) USM Autofocus Lens
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. Typical for Canon L grade lenses the build quality is great. However, you may need to get used to the push-pull zoom mechanism which is a bit unusual these days. Regarding the sum of its characteristics the EF 100-400L is THE still portable super-tele zoom for Canon users. READ FULL REVIEW