When using oblique or side-viewing borescopes to inspect objects with uneven surfaces or glossy finishes, halation can often become pronounced.
(standard coaxial illumination)
Using ring lighting designed for borescopes (indirect light) facilitates easier observation.
(optional ring lighting for borescopes)
The effectiveness of external illumination varies depending on the depth and diameter of the hole. It is feasible for holes up to approximately 10 mm in diameter.
