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