A superb ultra-wide angle

The sharpness of this lens is really beautiful! At all focal lengths, even at full aperture (which is not very large it has to be said, but in practice this is not a problem), it provides sharp images from the center to the edge. The autofocus is rather quiet and fast, but be careful precision. With such UGA (ultra wide angle), the depth of field is so great that this poses no real problem, but for perfect results on a tripod, it is useful to monitor the "live view". The manual focus ring is precise and even works with the activated AF.

This is not a critique of the goal, but mastering the photo UGA is a bit tricky. While the objective is remarkably rectilinear, the effects of perspective on the characters on the edges are quite enormous. He must be careful to place the faces near the center if you do not want to appear Martians with skulls worthy of Alien ...

In landscape photography, it is a wonder. It allows to embrace all the grandeur of a landscape! The result is very different from a pan, the outlook is highly exaggerated. With a 17-55 f / 2.8 IS and 70-200 f / 4 L IS, this is a perfect tripled for Canon APS-C sensor.