Further, {TAIL ~ the five lens system} can be implemented as {HEAD ~ part} of a fixed focus imaging system, or in conjunction with a variable focus optical magnification imaging system 
Further , { TAIL ~ the five lens system } can be implemented as { HEAD ~ part } of a fixed focus imaging system , or in conjunction with a variable focus optical magnification imaging system
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH