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