Canon EOS-1D Mark II N Manual De Instruções

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Selecting the AF Mode
To focus a peripheral subject not covered by the Area AF ellipse, follow 
the procedure below. This technique is called focus lock. 
Focus lock works only in the One-Shot AF mode. 
1
Aim the Area AF or AF point over the subject and press 
the shutter button halfway to focus. 
2
Keep pressing the shutter button halfway and 
recompose the picture as desired. 
3
Take the picture. 
Focusing an Off-Center Subject
 
If focus cannot be achieved, the focus confirmation light <
o
> in the 
viewfinder will blink. If this occurs in the One-Shot AF mode, the picture 
cannot be taken even if the shutter button is pressed fully. Recompose 
the picture and try to focus again. Or see “When Autofocus Fails (Manual 
Focusing)” (p.89). 
 
In the AI Servo AF mode when the AF point selection is automatic, the 
camera first uses the center AF point to focus. During autofocusing, if the 
subject moves away from the center AF point, focus tracking continues 
as long as the subject is covered by the Area AF ellipse. The active AF 
point does not light. 
 
In the AI Servo AF mode, when focus is achieved, the viewfinder’s focus 
confirmation light does not light and the beeper does not sound.