Canon EF-S 18-200 mm f/3.5-5.6 IS review - Chromatic aberration

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Canon EF-S 18-200 mm f/3.5-5.6 IS

22 June 2011

Arkadiusz Olech

5. Chromatic aberration

Slow constructions, such as 18-2xx mm lenses, usually don’t have any problems with longitudinal chromatic aberration. The Canon EF-S 18-200 mm is not an exception to this rule and you can see it very well in the photo used to test the autofocus accuracy, presented in chapter 10.

Much more problems are connected with lateral chromatic aberration. Exactly this aberration is mainly responsible for the weak resolution results on the edge of the frame at longer focal lengths. Let’s have a glance at the graph below.

Canon EF-S 18-200 mm f/3.5-5.6 IS - Chromatic aberration

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By and large only at 18 mm we can try call this aberration’s level medium. Everywhere else it is high, at 100 mm even huge. No 18-2xx mm lens corrects aberration in a perfect way but no other device has reached such a weak result as the Canon either. Bear in mind we talk here about lenses with wider focal ranges like e.g. the Sigma 18-250 mm or the Tamron 18-270 mm. The Canon is exceptionally weak in this category compared to its rivals and deserves to be seriously reprimanded.