Canon EF-S 10-22 mm f/3.5-4.5 USM
7. Coma and astigmatism
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In wide angle lenses it is hard to control coma on the edges of the field of view and the Canon 10-22 mm is not an exception. Coma can be noticed for every focal length and the biggest one is for 10 mm.
Another off axis failure - astigmatism - is controlled even better than the coma. The average difference between the parallel and horizontal MTF50 values is 7%, which makes the results quite good. However, there are significant differences between the individual focal lengths. For a 17-22 mm range, the astigmatism is traceable and reaches 3-4%, but as we expected, the astigmatism is becoming visible for a maximum wide angle and reaches as much as 15%.
