Comet 2009 P1 Garradd passing by the M15 star cluster.
Details
2011-08-03 in my Victoria backyard.
Conditions - clear and calm, 14 deg C with somewhat reduced sky transmission.
Orion 80mm APO with 0.8x reducer/flattener to give f/4.8 and a modified Canon T1i camera mounted on a Skywatcher HEQ5.
Exposure - 23 light and 20 dark frames at ISO 1600 for 60s plus 8 flat frames.
Processing in Images Plus and Photoshop with alignment centred on the stars.