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Allan,
"Normal" blooming only occurs in a vertical direction. Your artifacts appear to be in a horizontal direction. This can occur when full well is exceeded in the horizontal shift register (and Janesick, the CCD authority, calls this horizontal blooming, even though it may result in a dark line). This is the same effect that Peter mentions although it is normally seen with binning on the KAF8300 and the lines are typically shorter. I wonder whether you have the gain cranked too high? It should be set so that a full well results in an ADU value no larger than the maximum 16-bit unsigned value of 65355.
Cheers,
Rick.
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