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The contrast AF feature on DMC-L10 is available with the following Olympus lenses on the camera body firmware Ver.1.3 or later.
ZUIKO DIGITAL ED 14-42mm F3.5-5.6
ZUIKO DIGITAL ED 40-150mm F4.0-5.6
ZUIKO DIGITAL ED 70-300mm F4.0-5.6
ZUIKO DIGITAL 25mm F2.8
The proper firmware update is required to use Contrast AF reature for both Camera body and Lens,
Please visit Joint update service for Four Thirds lenses page for detail information and process of firmware update.