Pacman Nebula in Hydrogen Alpha

See color version: http://www.pbase.com/mariobmd/image/139178385
Info: http://en.wikipedia.org/wiki/NGC_281

Taken with a Takahashi TOA130 NFB with 67 Flattener and QSI 583wsg with Astrodon 5nm Halpha filter.
Image scale of 1.1 arcsec/pixel.
Guided with a Mini Borg 50mm and SBIG STi.
AP1200 GTO Mount
Exposure time:Halpha: 360 mins with 30 mins subexposure. Softwares: CCDAutopilot,Sky6 Pro,MaxIM DL,Focusmax, CCDNavigator, CCDStack and Photoshop CS2
Taken on October 7, 2011 in Jackson, Ohio