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Old 09-12-2012, 11:10 AM
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strongmanmike (Michael)
Highest Observatory in Oz

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 17,689
Hi Roger

Yes that is Residual Bulk Image or RBI and it is a problem with some chips including the KAF.

Modern cameras deal with it by flushing the CCD with an IR flash inside the camera before each exposure

Not sure there is much you can do about it other than warming the camera up and cooling it again and taking some dark frames before moving on..?

Mike
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