[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 fixed lens on this camera meant no zoom was possible. [Bastiaan] decided to address this shortcoming by building a Canon EF Lens Mount. The resulting build looks hilarious, but actually takes ...

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 ...

As a result, you'll have to do a bit of research into your lenses and cameras to make sure you're getting the right mount. After all, as evidenced by such pieces as the Canon EF-EOS mount adapter ...