Leica D-LUX 109 Instructions Manual page 129

Enabling/disabling MF Guide display
→ [Custom] → [MF Guide] → [ON] / [OFF]
Quickly focusing using Autofocus
→ [Custom] → [AF/AE Lock] → [AF-ON]
If you press [AF/AE] in Manual Focus, Autofocus is activated.
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Autofocus is activated at the center of the frame.
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When Autofocus is activated on the MF Assist screen, the
camera will focus at the center of the MF Assist screen.
129
Focus and Exposure Settings
Manual Focusing