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I do not put much stock in RBI. I do not say that it does not exist but I can say that I have been unable to see an impact in 10 years of precision photometry with KAF chips (ST-8, ST-9e, STL1001e).
The 1 occassion I was able to detect it, the 'ghost' image varied in brightness by less than 2% from the image background (next image inside 5 minutes) and was not apparent at all on the next image after that (another 5 minutes after that) and that was for a previously grossly over-exposed image where I had a mag 4 and 6 star imaged for 240 seconds on the STL at f/9.4 on a 14" scope.
Cheers
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