An amount of {HEAD ~ defocusing} performed by {TAIL ~ the defocusing mechanism} and a gain adjustment by the gain adjustment device are dependent on a content of the composite signal 
performed by
An amount of { HEAD ~ defocusing } performed by { TAIL ~ the defocusing mechanism } and a gain adjustment by the gain adjustment device are dependent on a content of the composite signal
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH