Tokina AT-X 535 PRO DX AF 50-135 mm f/2.8
4. Image resolution
This chart is an example of how zoom lenses should be made. High scores in all focal lengths, 40 lpmm level achieved and exceeded for wide range of steps and even for f/2.8. What else can we add? We can compare this with scores of Sigma 50-150 mm. Sigma can only compete with Tokina at 50 mm. For longer focal lengths it scores slightly lower and at the end it is significantly worse. To defend Sigma 50-150 mm we can add that it was harder to design and build because it has wider focal length range - 150 mm is 11% more than 135 mm.
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At the edge of the image, for focal length 50-90 mm Tokina can be compared even to good quality prime lenses such as 1.4/50 or 1.8/85 (Nikon or Canon brand). At 135 mm focal length scores are lower but still can exceed 30 lpmm which is considered good. So again, Tokina deserved our praise and defeated Sigma, which achieved similar scores only for 50 mm focal length.
Summarizing: if one can live without f/1.8-2.0 light then he can save some money and instead of buying 1.8/50, 1.8/85, 2.0/100 or 2.8/135 prime lenses he can buy Tokina 50-135 mm which has almost the same image sharpness. It may sound shocking and we were very curious how Tokina performs in our other test categories.
