Canon EF-S 18-55 mm f/3.5-5.6 IS
7. Coma and astigmatism
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When it comes to the frame edge, the influence of the coma on the circular diode image is visible at all focal lengths. Fortunately the deformations are not exceptionally huge and quite forgivable for this price point.
The astigmatism performance is visibly better – it is even nicer as we deal with a plastic construction here. The average difference between vertical and horizontal MTF50 values amounted to less than 6% - a result on the borderline between good and very good level.
