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While agreeing with most that is written here, I'd add that not all camera lenses are suitable for astro use. Even those "rated" highly by daylight/terrestrial users. CA, coma, and field curvature are always blatantly obvious when a star-field is imaged, not so with a portrait or landscape.
Astro and CCD combine to bring out the worst in optics somehow.
Having said that I have had good results with the Pentax 67 series, and a few of the Leitz/Leica series. I know others have had great results with the Nikkors.
Gary
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