If you are using this with a HTPC like me get the attached test pattern and put it in a folder by itself.
Open the folder and right click and "preview the file"
Then hit F11 to make it full screen.
Put a big mirror a couple of feet in front of the TV and go around back of the TV
Stare at the vertical and horizontal lines in the center circle.
Use Focus 1 to make the vertical lines as thin as possible.
Use Focus 2 to make the horizontal lines as thin as possible.
Repeat Focus 1 and Focus 2 at least 3 or 4 times.
You will be impressed with the results!
I tried lightly turning the third "screen" adjustment but it doesn't seem necessary.
Now the only other thing I might do is try degaussing the screen but it isn't bad enough to make worry about it too much.