Canon EF 24-105 mm f/3.5-5.6 IS STM review - Distortion

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Canon EF 24-105 mm f/3.5-5.6 IS STM

28 May 2015

Arkadiusz Olech

6. Distortion

When you attach the tested lens to the EOS 50D the distortion will be experienced only at the wide angle where you have to deal with barrel deformations of a very noticeable value amounting to −2.41%. The level of that aberration decreases with the lengthening of the focal length, being almost precisely zero (−0.02%) at 40 mm. Then you see pincushion deformations of +0.47% at 70 mm and +0.57% at 105 mm.

You’ll experience far more problems on full frame. At the widest angle you get quite distinct “barrel” which value we measured as −4.31%. Mind you it is a result for the whole frame. After looking closely you can notice traces of moustache distortion and it should be taken into account in your measurements. As a result, when we measured the distortion only for the area limited by the 1:1 markings its value increased to a very high level of −5.1%.

Like on the smaller sensor, the distortion becomes zero near 40 mm (the official result being +0.01%). At the 70 mm and 105 mm focal lengths you already deal with pincushion distortion which values we determined as, respectively, +1.08% and +1.36%.

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