I have just bought a 1DmkIV. I am not having good success with BIF shots and am wondering if I have the correct settings / technique.

I use the rear AF ON button to focus - I just keep the button pressed down, and use the main shutter button to just fire the shutter.

Is there a preferred combination to use with BIF? ie in cfn iii - 8, what setting would you advise?

Cheers