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"RE: Dust or oil ?"
Looks like dust to me, especially since it seems that it's smack in the middle of the frame. But it also looks like you cropped it to post, so I'm not really sure where it is.I will say that on my D3, it's usually dust near the center and often it's oil toward the edges, especially the top of the frame (physically the bottom looking into the lens throat).
_____Brian... a bicoastal Nikonian and Team MemberMy gallery is online. Comments and critique welcomed any time!