Decided to try the 48mm nebula filter mounted on the front of a Canon 85mm F1.8 with a reducer ring.
All pictures six exposures stacked with Registar.Each exposure 3min at ISO1600
at F2.0, in camera (20D) noise reduction on. Raw to Tiff, stacked, levels adjusted in Photoshop coverted to JPG, then filtered with Noiseware.
I am amazed to see part of Barnard's Loop.
http://users.bigpond.net.au/avandonk...2_filtered.jpg
http://users.bigpond.net.au/avandonk...1_filtered.jpg
http://users.bigpond.net.au/avandonk...1_filtered.jpg
Bert