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On my EM1X, when I select multiple AF groups (5 point, 9 point etc) and AF-C, then it will use the centre AF Point of that group as It's initial acquisition area (provided AF setting A1 - "C-AF Centre Start" and "C-AF Centre Priority" are set up to include within it's settings the AF group (number of focus points) you have selected. In that case, the AF point in the centre will illuminate green (as that's it's default point for the AF group) and switch to one of the other points in the group when the AF system determines the centre one is no longer the optimal focus area and it then uses one of the other points in the group (just one at a time) to acquire focus.
So (on mine at least), irrespective of how many focus points are in your selected group, only one will immuniate at a time. The only exception will be when you select all focus points where more than one AF point may cover the selected focus distance and so more than one focus square might illuminate at any given time.
So (on mine at least), irrespective of how many focus points are in your selected group, only one will immuniate at a time. The only exception will be when you select all focus points where more than one AF point may cover the selected focus distance and so more than one focus square might illuminate at any given time.