Sigma 18-250 mm f/3.5-6.3 DC OS HSM
5. Chromatic aberration
At the maximum focal length you won’t have any problems with noticing chromatic aberration as it reaches a high level of 0.15-0.17% in the whole aperture range. Similar values are seen for the combination of the shortest focal length and the maximum relative aperture. However, stopping down helps, making the aberration decrease to medium levels. As medium levels we can describe values the lens has in the 50-120 mm range.
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What’s interesting the Sigma’s results are a bit worse than those of the Tamron 18-270 mm VC. In its case we also saw the most problems at the longest focal length (aberration at the level of 0.15%) but for 50-100 mm focal lengths the aberration could decrease to even a low level.
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