Panasonic LUMIX S5IIX Operating Instructions Manual page 110

Basic Operations – Recording Using Touch Functions
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When the Touch Shutter fails, the AF area first turns red and then disappears.
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For information about operations to move the AF area
186)
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It is also possible to optimize the focus and brightness on the touched position:
(Focus on and Adjust Brightness for the Touched Position ([AF+AE]):
110
(AF Area Operations:
191)