Nikon Nikkor AF-S DX 17-55 mm f/2.8G IF-ED
7. Coma and astigmatism
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Coma is not a serious problem for the tested lens, although there are places where it can be clearly seen. You can observe it in the frame corner for the combination of the maximum aperture and the shortest focal length; it contributes to the lower quality of the picture. You can correct this disadvantage using the middle focal range. For 55 mm it increases again but only slightly.
Astigmatism will not bother us at all for a change. The average difference between horizontal and vertical values of MTF50 function reached only 2.8%, which is really a great result.
