Nikon 70-200mm f/2.8G AF-S VR ED-IF Autofocus Zoom Telephoto Lens.
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This is the most versatile lens you will ever use.
I believe it is one of the best for portraits.
It's amazing for closeups of wildlife as well as sports.
Between 2003 - 2009 this lens sold for 1699.00
Check it out at the link I've pasted below.