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Specify the gain parameters for the lens positioning servo of the autofocus
system.
This servo uses an error signal to control the lens position. The focus error
signal is fed into a PID controller. The proportional, integral, and derivative
gains of the PID controller are specified by the lpkp, lpki, and lpkd parameters
respectively.
When fmode is set to 1, the focus error is the difference between the lens
position sensor output and the target value specified by the lpos parameter.
When fmode is set to 0,2,3,4 or 6 the focus error is based on the optical
distance sensor output. See foffset.
These parameters affect the performance and stability of the lens positioning
servo. They should never be changed in the field.
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