A ll of the prime lenses on test have a modest viewing angle, so you wouldn’t expect to see much distortion. That’s borne out in our lab test results, which have impressively low figures throughout. Tested on a full-frame camera, the results for the Canon EF 24mm is a little worse than for some competing lenses, but not the Samyang 35mm. However, the distortion is effectively reduced when using it as a street lens on an APS-C format body. The Sigma zoom lens has noticeable barrel distortion at its shortest focal length and the Canon RF zoom is far worse.
Negative results of higher values indicate greater barrel distortion