LensTip.com

Lens review

Canon EF-S 24 mm f/2.8 STM

6 May 2015
Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

The longitudinal chromatic aberration doesn’t bother the tested lens at all - you can see that much in photos below, taken by f/2.8 and f/4.0.

Canon EF-S 24 mm f/2.8 STM  - Chromatic and spherical aberration


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Also the lateral chromatic aberration shouldn’t be a matter of concern. The graph below shows its correlation with the aperture value.

Canon EF-S 24 mm f/2.8 STM  - Chromatic and spherical aberration


The results oscillating between 0.08% and 0.09% mean that you deal with values on a borderline between low and medium levels. It is not a result you should worry about.

Canon 50D, f/2.8 Canon 50D, f/8.0
Canon EF-S 24 mm f/2.8 STM  - Chromatic and spherical aberration Canon EF-S 24 mm f/2.8 STM  - Chromatic and spherical aberration



Spherical aberration

The lens didn’t have any „focus shift” tendency so its spherical aberration isn’t very high. We tried to get more information analyzing defocused light circles but the parameters of the lens make it very difficult to get two equal circles in front of and behind the focal point big enough for such a test. Our effects are presented below; as you see the circles do feature some differences but it would be hard to draw any binding decisions, based on them.

Canon 50D, f/2.8, in front of Canon 50D, f/2.8, behind
Canon EF-S 24 mm f/2.8 STM  - Chromatic and spherical aberration Canon EF-S 24 mm f/2.8 STM  - Chromatic and spherical aberration