Leica D-LUX 109 Instructions Manual page 176

Changing the zoom operation settings
→ [Custom] → [Zoom lever]
→ [Custom] → [Control Ring]
Zoom
Step Zoom
Retaining the zoom position when the camera is turned off
→ [Custom] → [Zoom Resume] → [ON] / [OFF]
176
Changing the focal length (zooming) operates in the normal
way.
With each zooming operation, the lens stops at the position for
one of the preset focal lengths.
Stabilizer, Zoom and Flash
Using the Lens' Zoom Function