at 800mm and 10x live view zoom i can nail focus every time. sure it's shaky while i'm touching the lens, but it doesn't have to be still to be able to tell if a bright white object with sharp edge against a black background is in focus or not. it takes about 2 seconds after i let go for the shaking to stop, then click with remote. or use self timer.
I think my biggest problem is my tripod. It's an old crappy one, and it moves very sluggishly. It's a chore to get it to stay where I want it to...once it's locked it stays, but if I have something in the viewfinder, when I take my hand off of the camera, it moves a bit. Also, touching my camera when I am focused on something moves it so much that I can't tell if I'm in focus or not. Basically, unless I'm shooting something like a landscape, it's a crap shoot with this tripod.








