an image capturing element configured to receive {HEAD ~ object light} and generate {TAIL ~ image signals} representing an object image 
an image capturing element configured to receive { HEAD ~ object light } and generate { TAIL ~ image signals } representing an object image
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH