cirrus01: yep, Olympus really seems to have such equipment!
mono: well, on the one hand, there are our standard procedures that require around five meters distance between the tank entry and the light source. On the other hand, I wouldn`t want to be close to an ignition in the tank... :-)
Thanks for your answers!
J.V.
I forgot to add: The boys told me it might be hard interpeting what you see through a five meters flexiscope (poor lighting and feedback conditions). So, an explosions proof device would be the best...!
J.V.