I aligned the 44 frames on the head of Comet Lulin hoping to reveal more details.

C/2007 N3 Lulin – February 3, 2009
Constellation: Libra
Location: Death Valley National Park, CA
Optics: Borg 77EDII at f/4.3 on HEQ5 mount
Camera: Canon 20Da
Exposures: 44 light frames of 60 sec, ISO 800.
Process: Calibrated with 20 dark frames and 20 flat frames in ImagesPlus. Combined using MinMax Excluded. Colour balance adjustment and cropped in Photoshop.