This is a lens that I would like to acquire for nature photography. I'm watching on one ebay right now (http://cgi.ebay.com/Nikon-Nikkor-ED-400mm-lens-TA11727_W0QQitemZ130255323525QQihZ003QQcategoryZ3323QQssPageNameZWDVWQQrdZ1QQcmdZViewItem) but I have no way of knowing if the lens will even work. I certainly don't want to pay a good chunk of money for a lens that won't work. As it is a mf lens, there is a little less to worry about. I'd also want to get the lens chipped for my camera. Any thoughts?