I did sort of the same test with my Sigma 50mm 1.4 and I also did it at about 3 feet so that shouldn't be the problem.


You can download a test chart which makes it more accurate and reliable. They are free for download and available in multiple types. Just use google. Often these charts come with a good manual, so you'll figure it out.


I think you're perhaps having trouble with the extra sensitive AF point around the centre in this occasion. I'm not sure, but it might be your problem. There's too much around the centre to focus on.


Try your test again with a proper focus chart and see what it does.


Hope you'll be more lucky then,


Jan