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