A primary object of the present invention is to provide 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 {HEAD ~ the relay optical system} as a whole 
A primary object of the present invention is to provide 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 { HEAD ~ the relay optical system } as a whole
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