The Leica lens is unusually fast for a compact camera, with a maximum aperture of f/1.4. The 3.8x maximum zoom of the lens is relatively limited, however, and zooming limits the aperture. For example, at 2x optical zoom, the maximum aperture (lowest f-stop) is f/1.8, and at 3.8x zoom it is f/2.3.
No lens correction is applied to files stored in RAW mode (.RW2 extension). The following table provides empirically determined lens distortion factors that can be used with the GIMP image processing software’s “Lens Distortion” plug-in to approximate the lens-correction provided by the camera in its JPEG images:
Focal Length (mm)
Main (spherical correction)
Zoom* (image enlargement)
The experimental estimates for the “zoom” value do not follow any consistent curve, and a constant “zoom” value of -1.0 may be appropriate.