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The exposures were 1/15 second which does still add up to 6 minutes, yes. Your reasoning accounts for environmental dust although not for what many except Nikon believe to be oily spots such as on the following close-up of four spots from the 1139 image above. That is the core concern...

I've had a D800 for just over a year now and I've been having difficulty with a dirty sensor almost the entire time. I'll summarize the interactions with Nikon below. More detail is available upon request. I am looking to see if anyone with deep experience with Nikon and the D800 has suggestions...