There are some RVI applications that cannot be satisfied by a standard model fiberscope.  Olympus has always been at the forefront of application solutions, and when a situation arises where a standard instrument will not provide the desired results, then Olympus has responded with advice on optimal instrument use in that application.  This occasionally results in the introduction of a special instrument designed to meet that specific requirement - these are therefore known as special feature fiberscopes.  This is not to say, however, that they cannot be used in other applications.  The information below describes each model, together with its design application, but the specification may well suit a particular inspection you need to undertake.

IF5D4X1-14:
At 5.0mm (0.19") diameter and 1200mm (47") working length, this instrument was initially developed and approved for the Pratt & Whitney PT6 engine, but has since become used for the inspection of many small engines and fine diameter pipework.  It features two-way angulation, and interchangeable optical tip adaptors, allowing direct or side view, both supplied as standard with the instrument.

IF7D3X3-26 / IF7D3X3-32:
This 7.3mm (0.29") diameter instrument has been approved for use on the F100 and JT-9D aircraft engines and features an internal channel for introducing a working tool or guide hook into the inspection area to aid navigation around the engine.  It features four-way angulation (130° up, down, left and right) and the optical system is set to a 66° field of view, fixed focus (depth of field 8mm to infinity).

IF8D3X2-23:
The JT-8D engine inspection can be particularly difficult and is most effectively undertaken using an instrument in conjunction with a guide tube.  The