It is simple to recompose without remote shutter release. Eg, if I want to take a photo for my wife at a scene, all I have to do is to half press the shutter locking the focus and exposure, then turn the camera slightly to recompose such that she will not be in the centre of the frame. Bingo.
However, if I want to take a photo TOGETHER with my wife using remote shutter release - ie, camera on a tripod and I trigger the shutter using a remote control release (eg, Phottix Cleon), how can I lock focus and exposure involving a recompose?
Should I do it like this:
1. First, I focus the camera (on a tripod) at my wife half press the shutter to obtain the focus and exposure.
2. Next, press the AE lock to lock the exposure.
3. Turn the camera to recompose, reframe.
4. Run myself to stand next to my wife.
5. press the remote shutter release button.
But the above have the following drawbacks:
1. The AE lock will function only for a limited time (few seconds). If I don't press the shutter release remote botton within this few second, then the camera will re-meter using the recomposed frame.
2. I could only lock AE but cannot lock focus. When I press the remote shutter release, the camera will auto focus with the recomposed frame which is not the focus I want (ie, focus should be on me and my wife).
How to overcome this AE/AF lock while using the remote shutter release with recomposing?
I think one of the ways is to reassign the AE lock button such that it does both AE/AF lock at the same time. Is there a better way to deal with this?
By the way, I'm referring to the use of a Canon EOS550D.