I thought that I would get the same Canon EF 50mm f1.8ll only with a different focal length. I was pleasantly surprised that, unlike the Canon fifty dollars, in which autofocus lives its own life, YN hits without misses and there is no need to duplicate frames anymore. The only thing immediately after the purchase I set the autofocus adjustment +3 on the carcass, but this is 5 minutes. Satisfied with the purchase.