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