I took this the other night I took the Helix Halpha.
Again the beginnings of a narrowband image.
Planewave CDK17 with reducer giving F4.51.
15 minute subexposures and Vixen 95VMC guide scope with SBIG ST402 camera.
2 hours and 30 minutes.
http://www.pbase.com/image/136407602
I am really starting to like my CDK now.
Greg.