deviangel wrote in post #17887238
Do they miss AF a lot? How can I check if I get a good copy?
Would you suggest the Canon 50mm 1.4 as better option?
Well the problem is that I ran into issues with autofocus in sunset conditions (this should be an easy autofocus situation!) after the return period, and when I started shooting weddings, the AF would slow down to almost a second long. Even after optimizing with the Sigma dock, which only helps with accuracy but not precision, I'd still get random shots out of focus even in good light. As the light died in the evening, it'd go from 10/20% out of focus to 50-60% oof even after slowing down from .1 to 1 seconds. Extremely frustrating!
So if you wanted to test it, you should test it in several different conditions and press its limits, although I'm not sure if you can do that when buying used in person without a return period. To add insult to injury, the old Sigma isn't compatible with the autofocus optimization dock.
I think the 50mm f/1.4 is a great lens from Canon when I was starting out. The AF is probably more predictable even if it's not as sharp as the new Sigma Art's, something not as sharp in focus is better than something sharp but out of focus. I don't use the Canon 50's now just because I like the 24-70mm f/2.8L II more and I'm waiting on the 50mm f/1.2L II to match the Zeiss Otus 55mm f/1.4 with autofocus.