5D II Focus lock

[Photofanatic]

Can anyone please explain where I am going wrong with my new 5D MkII - I tried to lock the focus (half pressure on Sh rel) on a subject in the foreground but when I recompose the result shows the red focus square on the centre of the new composition - it doesn't stay where I locked it!! - I havent got it on servo or AI Servo. I am shooting in aperture priority and holding the * button for exposure lock.

Thanks -

Photofanatic

[Numenorean]

Uhm...your focus points don't move. If you recomposed, the points go with you. It should still not change focus in one-shot mode from where it originally locked unless you release and then half-press again.

[sandpiper]

Yeah, the red square just shows which focus point you had selected, it can't move it to where you actually focused. If you use centre point and lock focus on a point at the top left of the final image, after recomposing, then when you view the image and show focus points, it will show the centre point - in the middle of the image.

[noisejammer]

You might have more success if you activate back button focusing. It doesn't suit all things so it may be possible to dial it in as one of the custom modes.

[Gregg.Siam]

The red square AF points are a fixed position on the screen and never move.

When you focus and recompose, you are still on the same focal plane (distance from camera) so it should be in focus.

[Photofanatic]

Thanks everyone - it was me being dumb - I understand now!