Canon EOS-1D Mark II N Manual De Instruções

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When Autofocus Fails (Manual Focusing)
Set the lens focus mode switch to <
g
and turn the lens focusing ring to focus. 
Manual Focusing
 
If you select an AF point and press the shutter button halfway while 
manual focusing, the AF point will flash and the focus confirmation light 
will light when focus is achieved. 
 
During automatic AF point selection, when the center AF point achieves 
focus, it will flash and the focus confirmation light will light. 
 
With USM (Ultrasonic Motor) lenses:
After the lens focuses in the One-Shot AF mode, you can turn the 
focusing ring for touch-up focusing (full-time manual focusing). (Not 
applicable to USM lenses with no focusing distance scale.)