Hence, the eyepiece 3 which is connected integrally with the dioptry adjusting pin 8 is positioned at {TAIL ~ a constant photographing position}, permitting {HEAD ~ a photographing operation} 
Hence , the eyepiece 3 which is connected integrally with the dioptry adjusting pin 8 is positioned at { TAIL ~ a constant photographing position } , permitting { HEAD ~ a photographing operation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD