The focus of the projection lens 68 is located between {TAIL ~ the second aperture} 65 b and {HEAD ~ the projection lens} 68 
The focus of the projection lens 68 is located between { TAIL ~ the second aperture } 65 b and { HEAD ~ the projection lens } 68
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH