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