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I have always found the below settings to be very useful for the OK Button: 1) In playback mode I set the "Ok" to provide a quick large Histogram 2) In shooting mode I use the "OK" button to return the focus point to the center position. Helpful with Z series which doesn't have the ability to lock the thumbwheel causing focus point to move around by accident 3) I then set the f1 button to zoom into 100% which works for either playback viewing or focusing in shooting mode.
1) In playback mode I set the "Ok" to provide a quick large Histogram
2) In shooting mode I use the "OK" button to return the focus point to the center position. Helpful with Z series which doesn't have the ability to lock the thumbwheel causing focus point to move around by accident
3) I then set the f1 button to zoom into 100% which works for either playback viewing or focusing in shooting mode.