Thanks everyone.
Actually, your beaut image, Mike prompted me to take my pic of it. Mine is at the odd angle as when I rotate the off axis guider to locate guidestars the camera rotates with it and it ended up at that angle. As its time consuming doing trial and error shots, and as you say, the angle looks unusual, I decided to leave it there rather then rotate the camera (which can be rotated through 360 degrees independantly of the guider if need be).
I like your other HA images, Mike too,at
http://www.pbase.com/strongmanmike2002/emission_nebulae
Heres a comparison between 3 and 9 Nm Ha filters that may be of interest
http://www.narrowbandimaging.com/com...lters_page.htm
Scott