Canon EF-S 35 mm f/2.8 Macro IS STM
5. Chromatic and spherical aberration
Chromatic aberration
The tested lens deals with the longitudinal chromatic aberration very well. It would be hard to notice any colouring in images even in faraway, blurry areas and photos below emphasize that much. In this category the Canon fares distinctly better than the Nikkor 2.8/40. |
Now let’s check the correction of lateral chromatic aberration, presented by a graph below.
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It’s obvious also in this area there are no problems whatsoever. Near the maximum relative aperture the aberration is very low; on stopping down the aperture it increases to 0.06% but still it’s a low level which shouldn’t bother you.
The Nikkor 2.8/40 and the Tokina 2.8/35 had similar results with the lowest aberration near the maximum relative aperture and the highest after a significant stopping down of the aperture; still their results, even if good, were a bit weaker than those of the Canon.
| Canon 50D, RAW , f/4.0 | Canon 50D, RAW, f/16.0 |
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Spherical aberration
First photos of this chapter don’t feature any ‘focus shift’ effect. Still it doesn’t mean the spherical aberration is corrected in a perfect way. Defocused circles of light we got in front of and behind the focal point show that the aberration is present up to a point even though it is hardly intense. The circle before the focus features a noticeable rim which disappears in the circle after the focus.
| Canon 50D, f/2.8, in front of | Canon 50D , f/2.8, behind |
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