Canon EF 16-35 mm f/4L IS USM
5. Chromatic and spherical aberration
The crops, shown below, prove that the tested lens doesn’t have any problems when it comes to the longitudinal chromatic aberration.
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The lateral chromatic aberration correction can be described in similar terms – the graphs we get at particular focal lengths, respectively on the edge of the APS-C sensor and on the edge of full frame, are presented below.
At shorter focal lengths the aberration level reaches 0.06-0.08% so you deal here with low values, only momentarily approaching medium. At the maximum focal length the aberration is practically imperceptible – a round of applause!
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Spherical aberration
The first photo in this chapter shows that the lens has no ‘focus shift’ effect. The appearance of defocused light circles in front of and behind the focal point is more or less similar. Both these facts might suggest that the lens deals with the spherical aberration correction rather well.
