I have never had a go at this before so on advice I set my Canon 400d to ISO 1600 and took 3 x 20 minute lights with 2 darks as well as flats and bias frames.
Taken through W/O Flt 110 and guided with Phd. Stacked with DSS and processed with Photoshop cs3. Any comments welcome.
Mark,
I'm new on this forum and I hope that my english is correct, sorry for the gramatical fault
M33 is an object not easy to take but it's a good image with a lot of signal, but a little noise too, I think that you must set your cam to 800 iso max and taken more darks to limited this noise.
Olivier
Impressive image, up close and personal, lots of detail.
The background noise can be reduced by using Noise Ninja or gaussian blur on the background areas (you can even use the blur tool and rub it on the noisy areas only). Or reduce deep space noise action in Photoshop from Noel Carboni.
Hat's off to you Mark. A bit of 1600 noise as you said, but what a nice image! I agree with Greg that a bit of selective filtering (Median perhaps) could suck out a lot of the background noise.
As others have mentioned, the noise at ISO-1600 on the 400D is really not suited for astrophotography, but, regardless, that is excellent. Looks like you had your polar alignment pretty much spot on, too.
That's awesome Mark! Lost for words ... 
