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I get the same noise in my 450D pics as what is in Paula's pics, which I agree is different from the other pics in this thread. It just started happening out of the blue.
I call it streak noise, it's horrible.
The best explanation I have read but in truth haven't tested it is it comes from temperature spikes or drops between subs/flats/darks etc.
Adding bias seemed to help but then maybe that night was just more stable.
I'm hoping it is more a case of variable outside temps rather than the Camera getting old and overheating or it could be a battery getting hot.
Then again I have read that one solution is to stop using darks which is a simple way of going about it.
Also to dither but how to go about that when using the Polarie and whilst I'm snoozing in font of the telly escapes me.
Sorry to veer slightly off topic Jorge.
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