The apparatus includes a telecentric lens system positionable at a near end of a hole with an optical axis of the lens system aligned with {HEAD ~ the axis} of the hole to image {TAIL ~ the interior} of the hole 
to image
The apparatus includes a telecentric lens system positionable at a near end of a hole with an optical axis of the lens system aligned with { HEAD ~ the axis } of the hole to image { TAIL ~ the interior } of the hole
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH