M42 Great Orion Nebula
Canon EOS 5D MkII [ISO6400 51x32s] + [ISO800 35x16s]
254mm Newtonian f=1200mm f/4.8
HEQ5 equatorial mount, driven but not guided
2012 Jan 16 21:51:25-22:40:11 UT
This is a combination of 2 sets of images with different exposure settings (ie, HDR). This is because the set at ISO6400 32s completely saturates the central part of the nebula but ISO 800 16s does not show the outer parts.
Still done with my own GRIP software.