Tokina AF 193 19-35 mm f/3.5-4.5
7. Coma and astigmatism
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The Tokina 19-35 corrects the coma well, but not perfectly. Its slight influence on the shape of the diode is noticeable at all focal lengths. The deformations are not huge, though, so they don’t contribute to a significant worsening of the image quality.
We can have no serious reservations in the case of the astigmatism correction. The average difference between vertical and horizontal MTF50 function values, measured near the frame centre, amounted to 4.9% which is a very good result.
