[Dan K] had just such a lens from Sigma, but wanted to get it working fully with a camera using the Canon EF lens fitting. Hacking ensued. The lens in question was a Sigma 15-30mm f/3.5-4.5 EX DG ...

the Voigtländer Nokton 75mm f/1.5 Aspherical has seen a few physical tweaks for Canon and Nikon Z mounts to make the lens more of a cylindrical shape with fewer protruding parts, and in my ...