Yes I understand this. Astrophotography is often a trade off between one thing or the other. Though I am not sure about whether a trade up to the mark II will help. The 14-24 Nikon N lens is reputed to be the best in this class and it still gets seagulls wide open. That is why I shoot at 3.5 or 4 just to prevent this from happening. Not having done a timelapse yet I will have to take your advice on being wide open.
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