From my experience, longer subs just mean more CR hits, not longer streaks. From the sound of it, Peter's observations suggest some CCD's are more susceptible than others. My cameras are both QSI but have different CCD chips, the 540 showing few, if any, and the 683 showing plenty. With the proviso that I don't know much about CCD technology, I doubt that Cosmic Ray hits would do permanent damage as they happen 24/7 even when the camera is in the cupboard.
Interesting thread!
Charles
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