Third Party Manufacturers / Re: Is it time to consider Sigma lenses seriously?? competitive to Canon?« on: June 14, 2013, 11:33:37 AM »
I am about to pick up the Sigma 15mm diagonal fisheye. I will use it on my 5D3, but primarily I chose it for my IR converted 40D; it is supposedly fairly free of hotspots for IR. Anyone have any experience with this lens?