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