The eyepiece can be brought to a photographing position which is within the extent of {HEAD ~ adjustment} of {TAIL ~ the dioptry} 
of
The eyepiece can be brought to a photographing position which is within the extent of { HEAD ~ adjustment } of { TAIL ~ the dioptry }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL