[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 ...

doesn’t fully rotate completely around the lens but twists partway to the right or left to zoom in or out. While Canon has ...

After considering several options including custom machined adapters and mounting rings built from old Canon lenses, he found a much cheaper solution. He purchased a lens adapter made to mount a ...

Canon has been making cameras for professionals and hobbyists for a very long time, and the EF lens mount that it introduced in 1987 saw well over 100 million lenses produced for it. That all ...