Originally Posted by barcodes

Im a Canon guy, was going to refer you to this lens, I am sure theres a similar one for nikon maybe check the link anyway as there are sample images and maybe you can find a sigma or nikor with similar specs.

http://www.the-digital-picture.com/R...ns-Review.aspx

This famous photog works for nat geo etc. You can checkout his equipment here, all nikon:
http://www.joemcnally.com/blog/whats-in-the-bag/

If you find something of interest vcheck out borrowlenses.com
I have used them, they are dependable and fast with shipping. You can rent that type of lens for like 150ish for a month to try it out or less for less time.

Best of luck