Good job - the comet has good contrast against the sky. I think you might be able to push your black point up a bit higher to get some more pop out of the image (the trees are silhouetted anyway so clipping doesn't matter)?
All of my Canon lenses focus "past" optical infinity. The reason is apparently because the infinity focus point varies quite significantly with temperature - especially with wide aperture lenses.
Do you have LiveView on your camera? If so, it really helps with focus. I find that I need to turn my focus ring by fractions of a millimetre to get the focus perfect.
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