A fairly deep M81 processed to show the IFN. Even with lots of data it's a bit of a mess and I'm sure I should be able to do better, but that's a project for another day
The bulk of the data was captured with a TEC 160FL at Deep Sky West belonging to Jim and Linda Powell. I did blend a smidge of data from the RCOS 14.5 there just to add a little detail. That's why there are diffraction spikes.
Scope: TEC 160FL FL=1152.68mm
Mount: Paramount ME
Camera: SBIG STF-8300M
Filters: Astrodon
Image scale: 0.966 arcsec/pixel (Drizzled up)
Exposures: 23x900s R, 21x900 G, 25x900s B, 118x600s + 8x900s L, 10x1800 H (~44 hours)
Processing: PixInsight 1.8
There's a high res version on Astrobin:
http://www.astrobin.com/292719/0/
Thanks for looking.
Cheers,
Rick.