Canon EF 16-35mm 1:2.8 L USM

The Canon EF 16-35mm f/2.8 USM L was able to produce a very good performance in most aspects. The center resolution of the lens is exceptionally high regardless of the zoom and aperture settings. The border performance is lower specifically towards the extreme ends of the zoom range and at large aperture settings. At medium apertures the border performance is one a very decent level. The sweet spot of the lens is clearly at 24mm where it easily outperforms all tested Canon fix-focals to date. Typical for most full frame lenses vignetting is no big issue on an APS-C DSLR. The high barrel distortions at 16mm as well as CAs at 24mm could be a little better. The build quality of the lens is great and it is a joy to use. All-in-all it is a very good lens but if you don't need the f/2.8 setting and that extra mm at the wide end you may as well save quite some bucks by preferring the EF 17-40mm f/4 USM L which performs basically just as good.