Canon EF 35 mm f/2.0
7. Coma and astigmatism
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Before we write anything else we would like to say that the coma and astigmatism are the causes of deterioration in wide aperture picture resolution. As you can see in the picture below, the coma is visible at f/2.0 and even changing to f/2.8 fails to eliminate the coma completely.
Astigmatism is an even bigger problem. The average difference between the vertical and horizontal MTF50 values reaches as much as 17%.
