Hi Mate, I shot the Milky way from time to time and I use the rule of 600 on my D7000. (Small sensor) but as you can tell from my avatar it works pretty well but is only a rough guide so best to play around with it a little. But in saying that...600 is what I work off. :-). (If you do zoom in on your final image there is small trailing but normaly its fine unless you really go looking for it!!!
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