Can anyone guide me on correct method of AE Lock, lost my manual and google online help, only managed to find the following steps, not sure correct. Let me know if it is wrong. I am using Canon 40D.
1) Switch to AV/TV/P mode, use centre focus point.
2) Point Camera to a object(how to determine which object?) and half press to get the setting
3) press '*' button on the camera to lock the setting
4) Recompose the shoots and full press. (only have 10secs to recompose after step 3)
Is the above steps correct?
from the below shots, which area should i determine for step 2?