Nifty Fifty...50mm f1.8 II..by Ken Rockwell

rsn48 wrote:

The problem with the f1.8 lens or the f1.4 lens for that matter is that it is very easy to blow the focus, been there done that, have the T shirt to prove it. I will include a photograph I like. Basically I blew the focus while shooting thus creating a seemingly poor focused image, but the image does have "critical" just in the wrong area.

Many new to a lens like the Canon 50 f1.8, f1.4 and f1.2 don't always "get" how critical and difficult it can be to nail a good sharp image where they wanted that sharpness to be. And their conclusion, the lens isn't sharp!