a focus detection unit configured to performing {TAIL ~ focus detection} on {HEAD ~ the basis} of the phase difference detection signal 
a focus detection unit configured to performing { TAIL ~ focus detection } on { HEAD ~ the basis } of the phase difference detection signal
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH