Sorry to hijack this thread, but it is relavent.
So I've gotten some 34 min exposures of the stars, and that's all wonderful, however there's quite a bit of... well actually a whole heap of noise in the images. The noise increases as the shutter speed decreases. My guess is this is simply a sensor issue and can't be fixed, but then again that's only my guess. Does anyone know if there's a way to decrease all that noise? (I have played around with ISO).
I've done quite a bit of searching but I have a feeling that (and please excuse me if) I'm being a bit thick.
EDIT: I'd just like to point out that it's not the hot pixels that I'm referring too - I'm aware of that problem and it's fixes, what really gets me is that red noise