Thanks for the kind comments. Here is a Carina done on the same night. Focus drifted a bit as ambient was 24C when data collection started and dropped to 18C when finished. I have the lens temperature thermostatically controlled at 16C so it had not kicked in yet.
Large Image 3MB
http://d1355990.i49.quadrahosting.co...02/carnfr1.jpg
Note how well the dust stands out.
If the weather is kind will do some mosaics.
Bert