As third-party optics, the two new Sigma lenses don’t feature Canon’s control ring or have a switch to toggle between manual and AF, so here we’ll run through some tips to set up your Sigma ...

[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 ...