Bore scope and Videos cope technologies have advanced dramatically when the small-est common diameter was 16 millimeters; the lightest processor included a cathode ray tube (CRT) monitor and a system required a separate and detached light source. The inspection processes are more thorough, efficient, more easily accomplished and more reliable than ever before, given the advances of the core imaging technology. Typical viewing directions, based on application include: side viewing, direct viewing, fore-oblique and retrospective, where a bore scope is actually looking towards the entrance port of the inspection and almost back on itself.The magnification of the optical system is dictated by the field of view. If the field of view is narrow, the object target magnification is higher and vice versa. System bright-ness is determined by aperture design in the objective and may maximize brightness at a fixed or limited focal range or average the same over a greater depth of field.