Nikon Nikkor AF-S DX 18-70 mm f/3.5-4.5 IF-ED
7. Coma and astigmatism
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Coma is well corrected for the whole focal length range. It is noticeable, but it is not even of average level. It is showed in these frame clippings below, which were obtained from its center and upper right corner.
The astigmatism is a whole different story and, here again, you will read more about this in the summary. I'm going to add here that the average difference between horizontal and parallel MTF50 values in the center of the frame is 14%, which is not a great result, but it is not a bad one either.
