A primary object of the present invention is to provide {HEAD ~ a relay optical system} for non flexible endoscopes which has a wide range of application, can be manufactured at a low cost and has {TAIL ~ longitudinal chromatic aberration} favorably corrected in the relay optical system as a whole 
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A primary object of the present invention is to provide { HEAD ~ a relay optical system } for non flexible endoscopes which has a wide range of application , can be manufactured at a low cost and has { TAIL ~ longitudinal chromatic aberration } favorably corrected in the relay optical system as a whole
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH