the Sigma 16-300mm is an APS-C lens available for L-Mount, Sony E, Fujifilm X and, as an EOS R-series user, I was delighted that it's also available for Canon RF. I tried out the RF mount version ...

[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 ...