The new Samyang XP 10mm f/3.5 is the World’s widest, non-fisheye, distortion free prime lens for Canon and Nikon DSLR cameras.

The new XP 10mm f/3.5 lens encapsulates the brand’s universally respected optical technology, especially in the wide angle lens category. It provides the ultimate in ultra-wide-angle coverage (up to 130° angle of view), with crystal-clear, non-fisheye image quality. This lens can also be used with APS-C models where it will provide a 15mm equivalent focal length.
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https://www.dailycameranews.com/2019/02/samyang-xp-10mm-f-3-5-lens-announced-worlds-widest-and-distortion-free/