Sigma 17-50 mm f/2.8 EX DC OS HSM review - Chromatic aberration

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Sigma 17-50 mm f/2.8 EX DC OS HSM

30 July 2010

Arkadiusz Olech

5. Chromatic aberration

Chromatic aberration is controlled well at longer focal lengths. At 30 and 50 mm the graphs are very similar, showing a slight decreasing trend on stopping down the lens. The aberration decreases from near 0.10% to 0.07% so its level is low or medium at the most.

Sigma 17-50 mm f/2.8 EX DC OS HSM - Chromatic aberration

The most serious situation we see at the shortest focal length. The aberration decreases on stopping down too but near the maximum aperture it reaches 0.15% so a high level. It will be fully noticeable in real life photos.

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Looking at the picture of the autofocus accuracy test chart, presented in the chapter 10, we see that the lens doesn’t have any serious problems with the longitudinal chromatic aberration.