Comet Lovjoy moving through Taurus and passing by the Pleiades, as seen from central France on the evening of 12 January 2015. My Sigma 50-150 is not the sharpest near the edges at f/2.8, but the softness near the Pleiades is hard to explain for me (the lens didn´t dew up, of that I´m sure).
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This is a stack of 73 light frames (4s, iso 6400) at f/2.8 and 54mm, using 49 dark frames, 19 flat frames, and 46 bias frames. The image was stacked on the stars in DeepSkyStacker.