Lens review
2007-09-23
Canon EF-S 10-22 mm f/3.5-4.5 USM
10. Autofocus
The USM motor equipped Canon 10-22 mm handles zooming very well. The autofocus works quietly and fast. The number of errors made in testing conditions was 6%, most of which were made with minimum zooming, which is satisfactory since the depth of the field is always the biggest there. The results can be considered very good.
With such a large view angle and average light, we view such a large depth of field that the back or front focusing problem, even if it exists, is really marginal. In our case, we had the impression that the lens had a slight tendency towards front focusing. It was visible only at a focal length of 22 mm, wide open aperture and at a very short distance from the photographed object.
