see also:
Comet Lemmon with 47 Tucanae globular cluster and the Small Magellanic Cloud (SMC) taken with Olympus OM-D E-M5 camera and Canon EF 135mm f/2.0L lens at ISO 3200, f/2.0 and 60secs on Feb 16th 2013
No cropping, single shot with automatic dark frame subtratction in-camera, and minor tonal adjustments and purple defringing.
Earlier in the night, I imaged it with the Olympus 75mm f/1.8 lens at f/1.8, ISO 1600, 60secs, but had to crop it 50% to give this image: