The Banding is an issue with the D300 as well. I usually shoot astro at ISO800 and get a great result. The first image shows the Milky Way from The Coal Sack to Scuttum and is a combiation of 3, 5 minute exposures. the Lens was the 11-18mm Tamrom f4.5.
The Second image shows the banding which was taken using my 70-200 f2.8 Nikon Lens.
The last is a 10 Second exposure with my 50mm f1.4 taken at bucketty.
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