If you're going to use the center AF point only...

Thanks for your concern, and I'm sorry if i didn't put it clear enough.  My point was (in the 2nd post) only to point out that there is one recomposition method that does not move the focal plane around:  By rotating* around the axis that goes through center of all the lense elements will not change the focal plane position.

*(as you would when changing from portrait to landscape orientation of the camera)

All it takes is keeping your head and the center point at the same spot throughout the process of rotating and maintaining focus.

But i admit the gain is little compared to just using the closest point. I did one test just to see if i could see any difference; and the difference was very little (i am not sure i am able to recreate identical result). Me not standing still would be a greater cause of error in the procedure compared to a minor recompose. Images processed equally (50mm f1.8, ~1,5m sharpness 3, fineness 0 in DPP). The pen box text is what i focused on. The rest is supposed to be blurry to show how the image was recomposed. Image is best viewed at 100%/original size if you want to see any differences.

Focus and recompose using closest focus point vs focus and rotate using the rightmost focus point.

-Yngve