Just a test to see how many frames are needed to bring up all the dim outer stuff. As usual more is always better.
Exposures 14x16 min in 3nm HA.
Large image here 11MB
http://d1355990.i49.quadrahosting.co.../HELIXN_HA.jpg
Full res 16 bit tiff here to play with. 14MB
http://d1355990.i49.quadrahosting.co.../HELIXN_HA.zip
Looks a bit lonely. At least now the star field is good to the corners with the new rings. There is a tiny bit of flexure still.
Bert