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.