Vidicon Tube Sun Burn In

Older TV/video cameras used tubes to convert light in to an electrical signal instead of the now ubiquitous CCD, these tubes were quite limited and had many operational problems but they still have a cult following today due to there unique characteristics. The feedback produced for the original Doctor Who series was done by pointing a camera with a video tube at its own monitor. Similar effects can be produced with other technologies such as CCD but they are not as fluid and have a different esthetic. Another problem with Vidicon camera tubes is that very bright sources can damage their surface resulting in areas where the tube "goes blind"

I think that this is actually kind of cool almost like drawing with light as seen in David Hall's 1973 Vidicon Inscriptions here

here is a video from videolabguy on youtube demonstrating this problem his other videos and website are an amazing collection of useful info on vintage video gear