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I'm not an expert, nor do I know much about Nikon lenses, but I found that only a few camera lenses were really good for astrophotography when I was doing a bit of widefield stuff. My expensive Canon L series lenses introduce ALOT of coma, which was a bit disappointing. Found my 100mm macro lens ($1000 worth) is awesome at f2.8-f4 ish. Do a google search. There was a website listing lenses best suited to astrophotography, but it slips my mind.
Hope this helps.
Erik
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