I have the same problem with you Paul. I am using Sigma 17-70mm / 2.8 - 4.0 and EF 50mm /1.4 lens. I had take over 500 photos and found that at least 50% of them with a little out of focus problem or blurry. I had try stop down the lens, it was better but not what I prefer to had. I took photo with my Canon G6 and 30D at the same situation and shutter and aperture settings. G6 got a very sharp photo but not by 30D !
I don't think PS or stop down the lens are solutions, and I believe that 30D MUST better then G6. I start to re-setting my 30D body, and found that the problem is come from focus mode of 30D. When I set to "AI focus" mode, nearly all photos were correctly focus even in a relatively dim environment. Of course I got all sharp and clear photos. But I don't know why "One shot" focus mode cannot get a accurate focus. It was my experience, you may try it and verify the result.
Clarity and Sharpness with 30D
in Canon EOS Mount
Posted
I have the same problem with you Paul. I am using Sigma 17-70mm / 2.8 - 4.0 and EF 50mm /1.4 lens. I had take over 500 photos and found that at least 50% of them with a little out of focus problem or blurry. I had try stop down the lens, it was better but not what I prefer to had. I took photo with my Canon G6 and 30D at the same situation and shutter and aperture settings. G6 got a very sharp photo but not by 30D !
I don't think PS or stop down the lens are solutions, and I believe that 30D MUST better then G6. I start to re-setting my 30D body, and found that the problem is come from focus mode of 30D. When I set to "AI focus" mode, nearly all photos were correctly focus even in a relatively dim environment. Of course I got all sharp and clear photos. But I don't know why "One shot" focus mode cannot get a accurate focus. It was my experience, you may try it and verify the result.