Tokina AT-X 124 PRO DX II AF 12-24 mm f/4
7. Coma and astigmatism
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The theory that some changes in the Tokina’s optics were made after all, might be supported by the result connected with the coma. In the old model the coma was the lowest at 12 mm and it increased with the rise of the focal length value. Here, the level of this aberration is the highest at the shortest focal length but it decreases with its lengthening - you can see it in the crops below. The trend is exactly the reverse then. Even at 24 mm, though, the coma doesn’t decrease to zero, so its influence is still noticeable.
In the previous model, the astigmatism was corrected well and it amounted to 6.6%. In the 12-24 mm II model the astigmatism’s value increased to 9.5% so started to fluctuate near the medium level.
