Lens review

Sigma 18-200 mm f/3.5-6.3 II DC OS HSM

5. Chromatic aberration

Such slow constructions as a 18-200 mm lens rarely have any problems with the longitudinal chromatic aberration. The new Sigma is not an exception to this rule – the level of that aberration is low. Looking closely at the photo below you can notice that the objects before the focal plane have slightly blue hue and those situated behind it are yellowish. This effect is not very pronounced, though, and certainly it won’t be bothersome on photos.

The problem of lateral chromatic aberration can be assessed by looking at the graph below.

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Once again we get an interesting result here because the new model fares definitely better than the older one, in which case the aberration could reach as high as 0.14%. Here we get a significantly better performance. The highest level of this aberration is observed at the shortest focal length but even there the aberration remains just average. At longer focal lengths it is either medium or low. Taking into account the focal range these results can be assessed as very good without any hesitation.