Canon EF 28 mm f/2.8 IS USM
5. Chromatic and spherical aberration
Chromatic aberration
With this fastness of the lens we didn’t expect any serious problems with the longitudinal chromatic aberration and we were right – the photos below show it perfectly well.
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The lateral chromatic aberration increases slightly on stopping down but nowhere it reaches high values, only momentarily getting close to medium ones. Here the lens should be praised, then.
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Spherical aberration
Spherical aberration in the tested lens is properly corrected. We didn’t notice any focus shift and defocused images of light points situated in front of and behind the focus are similar, without any significant local extremes. It is true, you can notice a darker ring in the first of those circles but its intensity is not high.
