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It might not necessarily be a camera defect. You can get this kind of thing when you do dark frame subtraction and the dark frames aren't of good enough quality - they differ too much from the actual dark frames required for a perfect match. Then you end up subtracting pixel values where you shouldn't be so you end up with black pixels where there shouldn't be.
If this is the case, averaging dark frames and then subtracting that resulting averaged image helps.
Roger.
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