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Are you using long exposure noise reduction? I find that the D800 has some noise without LENR that is really hard to clean. Is that your experience as well, or do you have software that helps?
For this image no, but I might do a dark frame or two in the future just to have it. Although, honestly, the noise wasn't a huge problem. With the conditions as cold as they were heat wasn't mucking things up, plus the original image was pretty bright. When I set a black point the noise got under control pretty quick. I'd have no concerns printing it 24x36.