I purchased a Canon EOS 650D and EF 50mm f/1.8 II lens.
Unfortunately, the auto-focus seems to miss focus at f/1.8. I've tried setting it to single-point auto-focus: it is better, but still not good enough.
This is my first DSLR, so is this likely a result my lack of skill, or perhaps is the lens at fault?
I made some tests on a target. Here is the result:
The focus is at 1cm in front of target.
Aperture f/1.8, ISO 250m, Exposure time 1/250