Comet C/2011 L4 (PANSTARRS) on 24/03/2013 at 21:20 through 120/600mm f/5 Skywatcher telescope and Canon EOS 5D Mark II camera, one shot at 8s exp. Taken from Kananaskis Country near Bragg Creek.
The comet was also visible by naked eye below and inbetween the constellations of Perseus and Cassiopeia close to the western horizon. It has a bright but quite compact coma and beautiful tail. Nice comet!