Tokina AT-X 116 PRO DX AF 11-16 mm f/2.8
7. Coma and astigmatism
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The crops presented below show how a diode’s circular image changes as we move from the frame’s center to the corners. As we can see, coma can really get in one’s hair. For each and every focal length, the diode’s image is clearly deformed, which can’t fail to influence the corner image quality.
When it comes to another off-axis aberration – astigmatism, the situation is better. The average difference between horizontal and vertical values of the MTF50 function equals 7%, which is a good result.
