{TAIL ~ The apparatus} further includes a camera arranged to receive an image of the illuminated interior of the hole from {HEAD ~ the telecentric lens system} 
{ TAIL ~ The apparatus } further includes a camera arranged to receive an image of the illuminated interior of the hole from { HEAD ~ the telecentric lens system }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD