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apparently there are 6
1.) 1982 - 1988: AI-s manual focus. 15/11 elements, f/32 minimum, 8.2' (2.5m) close focus, huge 95mm filter, 1,900g (over 4 pounds!), 231mm long. It cost four times what the f/4 manual focus 80 - 200 mm lens did, which is why few were sold and why you'll probably never see one.
2.) 1988 - 1992: AF, 16/11 elements, 1,280g, 176mm long, f/32 (f/22?) minimum, 3 position focus limiter.
3.) 1993 - 1997: AF-D,16/11 elements, 1,300g, 187mm long. Nikon Product number: 1985 NAS.
4.) 1997 - present: AF-D, 16/11 elements, 1,300g 188mm, two-ring zoom, tripod collar, $825 US new, fast autofocus. Very strongly recommended.
5.) 1999 - 2004: AF-S, 18/14 elements, 1,550g, 207mm, two-ring, tripod collar, $1,500 US new, fast autofocus.
6.) 2003 - present 70-200mm VR, 21/15 elements, 1,430g, 215mm, two ring, collar, $2,000 US new, fast autofocus.
[quote from ken rockwell]
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