JRobot

Does anybody know what the focal length of the module is?

Hi Ringo,
The focal length of the C3088 (which is the "official" name of the camera module that uses the OV6620 and the particular lens I ship with it), is 3.7 mm.

These cameras are also available with a 4.9 mm lens. These additional lenses can be purchased at http://www.electronics123.com.