Quote:
Originally Posted by Paul Haese
Alex, I think this depends on whether you are using full frame or not. On my D3 with this lens I got seagulls at the corners and edges. No lines. With my stars over the murray shot I used F3.5 got lines in the edges but no seagulls like at 2.8. I figure the extra real estate makes for the extra distortions at wide open. Are you using yours on a full frame or crop?
Sorry Phil for the hi-jack. 
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Full frame Nikon D700.
Attached are two unedited top corners of the full frame from a recent image at 14mm, f/2.8, 30 sec, ISO32000. Note that in "Corner 1" the stars are more elongated because it is further away from SCP.
Cheers,
Alex