Tokina AT-X 107 DX AF Fish-Eye 10-17 mm f/3.5-4.5
7. Coma and astigmatism
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From the pictures below one can easily notice that the coma does not cause the picture to worsen on the frame edge and it is corrected in a proper way. On the other hand however, looking at the picture of the sky shown at the end of the test, you could see the coma together with the blur making the resolution of the picture much worse.
As far as astigmatism is concerned, the situation looks slightly worse. The average difference between horizontal and vertical MTF50 values measured in the center of the frame reached almost 12%. It is also worth mentioning that the astigmatism was higher for the 10 mm and here, again, the distortion and projection specifics can influence the test results.
