Canon EF 55-200 mm f/4.5-5.6 II USM
7. Coma and astigmatism
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The Canon 55-200, especially in the 55 mm to 100 mm focal lengths, corrects coma very well at the edges of the frame. This is a result of the very small differences in MTF50 value measurements in the center and at the edges of the frame. We wrote about this above and the results can be seen in the pictures in the MTF50 charts.
Astigmatism is at a low level in our lens. The measured difference between the horizontal and vertical MTF50 values in the center of the frame is 3.5%. The lowest values were measured at the 200 mm focal length.
