Canon EF 20-35mm f/3.5-4.5 USM Reviews

This lens is the clear value in Canon's ultra wide zoom lineup. Performance is better than any of the L lenses in this class. Sharp enough wide open, and sharp as a tack at f/5.6 till f/11 when performance drops quite rapidly again because of diffraction. The only complaint I have is that it has some mustache style distortion at the extreme edges of the frame at the 20mm setting, which improves at 24mm and is gone by 28mm. All in all a great lens, good build quality, fast AF, and the best value in ultra wides in the whole of the Canon lens system.