[abacus07]

i have noticed maybe 50% of my autofocus shots with any of my lenses ( about seven lenses ) have poor focus . sometimes more than that, 75% not focused; even with my manual lenses it's difficult to get really sharp focused shots more than half the time. so, why mess with autofocus at all?

Are you using your eyes to confirm the focus is where you want it? If you're just pointing and shooting then I wouldn't be surprised if you're missing focus so much.