Tokina AT-X 535 PRO DX AF 50-135 mm f/2.8
7. Coma and astigmatism
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Coma is practically invisible at 50 mm. It appears at 90 mm and grows a little at 135 mm. In any case it is not at significant level, so we may recognize that coma correction is good. And again we must notice that Sigma performed better in this category showing almost no coma.
We have opposite situation when it comes to astigmatism. Tokina showed 6.3% mean difference between horizontal and vertical MTF50 values for all focal lengths. Sigma 50-150 mm corrected astigmatism in good way only for 50 mm and for greater focal lengths scored clearly above 10%.
