Dave,
Great set of images. I had your site bookmarked. I found it from a cruise round Astro sites while studying this aspect of imaging in a bit more detail.
Perhaps you should fire up a Astro Photoraphy thread when you have time, to keep all this valuable info in one place.
Well done again for the inspiartion to broaden our photographic horizons.
Stevie was also well impressed. All I could hear as she looked though was .......... cor ..... wow .............. amazing.
Don