Only managed to get two images before cloud came. I was trying to go as deep as possible to pick up the gas and dust. There is a bit of noise which usually disappears when stacking many images as a median.
Large image 1MB
http://members.optusnet.com.au/~cheekyfish/oriongas.jpg
Details
Canon 5DH, Canon 300mm F2.8L at F2.8, 2x15min at an ISO of 200, ICNR ON, Corrected for flats in IP, stacked with Registar, digitally developed in IP and levels and curves in PS.
Bert