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hi Ray,
do you know what the temperature of the sensor was when you took these subs apart from ambient temperature? Are you able to post one of the raw subs here?
I took 5 minute exposures last night at iso800 using my unmodded uncooled 1000d, wasn't too bad. sure there was noise, but not unmanageable. so there might be something wrong or it must've been a pretty warm night.
when you say noise, are you referring to the coloured specks or pixels all over the image? The in-camera noise reduction is normally quite effective. you mention that you can't see any hot pixels, but in the stacked image, you see a lot of noise? is this correct?
To effectively remove noise with darks, you need to dither the frames. not sure what software you're using for scope control or are you using the hand controller?
you usually enable dither in your main capture software that can talk to the mount and its usually done via the guider. the software will move the scope one or two pixels between every frame, but since you're not guiding, I'd suggest manually nudging the scope a tiny bit every few subs.
That way, DSS or other software will see the noise as a fixed pattern which hasn't moved and subtract it.
have you tried taking a dark and stretching that to see how much noise you have?
if you can't post a raw sub, can you take a screenshot of what you see when processing and post that?
Have you looked at software like BackyardEOS? makes capturing images very easy and its relatively inexpensive. It has a plugin for phd dither, but that's for when you start autoguiding.
Cheers
Alistair
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