The Canon RF 28mm f/2.8 STM produces a heavy (4.1%), albeit not excessive, degree of barrel distortion in RAW images. As usual, auto-correction reduces the issue to a negligible degree. If you choose JPEG-only output, you can't even disable auto-correction in the camera. 28mm (corrected)
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Canon RF 28mm f2.8 STM review so far; Zhongyi Mitakon Speedmaster 85mm f1.2 review; Canon RF 100-300mm f2.8L IS USM review so far; Canon RF 24mm f1.8 STM review; Canon RF 100mm f2.8L Macro IS USM review; Canon RF 14-35mm f4L IS USM review; Canon RF 100-400mm f5.6-8 review; Canon RF 16mm f2.8 STM review; Canon RF 5.2mm f2.8L Dual Fisheye .