Canon EF 24-105 mm f/3.5-5.6 IS STM
5. Chromatic and spherical aberration
In a lens with such an aperture fastness I didn’t expect any problems with the longitudinal chromatic aberration correction and yet they are noticeable. It is interesting, and a bit worrying too, that its level doesn’t decrease with the change of aperture from f/5.6 to f/8.0. Still in order to be completely honest you have to emphasize the fact that its values are never high, keeping rather medium levels.
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The graphs presenting the lateral chromatic aberration in correlation with the aperture and the focal length values are presented below. The first one shows the performance on the edge of the APS-C sensor, the second one concerns the edge of full frame.
It’s the easiest to notice the lateral chromatic aberration at 70 mm where it reaches a medium level. At other focal lengths the problem is slight or even imperceptible. In this category the lens manages quite well; especially its performance at the wide angle, notoriously difficult to correct, should be praised here.
| Canon 5D III, 40 mm, f/16.0 | Canon 5D III, 70 mm, f/5.6 |
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Spherical aberration
The first photo, presented in this chapter, shows that you deal here with a slight “focus shift” effect. When you pass from f/5.6 6o f/8.0 the depth of field moves slightly toward the greater distances. It suggest the spherical aberration correction is not properly done.
The appearance of defocused light points proves that much. In front of the focus you deal with a lighter centre and a darker edge, behind the focus the centre is darker and the rim on the edge of the circle is very light indeed.
| Canon 5D MkIII, 105 mm, f/5.6, in front of | Canon 5D MkIII, 105 mm, f/5.6, behind |
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