Nikon Nikkor AF-S DX 18-135 mm f/3.5-5.6G ED-IF
7. Coma and astigmatism
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The coma in the Nikkor 18-135 mm is corrected at an average level. For every focal length the diode spot picture in the corner of the frame is distorted to a clear coma.
The astigmatism, however, is very well corrected. The average difference between the horizontal and parallel MTF50 values in the center of the frame reached 8.7%. We also noticed that the astigmatism reached its lowest value at the 18-35 mm focal length range, while reaching higher values at the rest of the focal length range.
