Strange, I have also a lighter background on the bottom (north) side.
Mine is taken with 10x30s with EF 85mm f/1.8 squeezed to 2.5 @ ISO6400 with a 6d as well.
Post processed with Darktable.
To be honest, you have used too aggressive noise supression as I see a patchy background and the stars can be brighter by stretching the 'levels' in Photoshop or darktable.
Is your pic cropped ? My 85mm shows slightly more than your 50mm.
Last edited by skysurfer; 27-02-2014 at 03:32 AM.
Reason: better photo
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