It wasn't designed for in-use, on-the-fly switching, in my opinion. You
should set your preferred focus point in advance, sort of like the Pentax
functions. I don't think it is useful at all, or was designed to be useful,
to switch focus points with the camera to your eye, ready to shoot. It is
infinitely easier to move your camera a matter of millimeters to place your
selected focus point on your desired focus target. If you are finding that
the automatic selection of focus points by the camera sometimes picks up
something with more contrast than your desired focus target, then you should
select a permanent focus point and use that all the time. Trying to use the
switch to get the camera to re-focus on your target, when all you really
have to do is press the shutter half down with a selected focus point on the
target, then recompose, as you have no doubt been doing for many years, is
so obviously crazy that I am certain the camera designers never intended
focus point switchability to be an in-use convenience. It's an option
designed to be pre-set. Select the lower center point and forget about it if
you are having problems with auto selection jumping around.
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