Chi ha questo obiettivo? Ne ho trovato uno usato. Quante versioni esitono? ho notato anche una versione AF-I

Vorrei sapere: chi lo ha avuto o chi lo possiede se � contento...

Grazie

History of the Nikon 300mm f/2.8
http://www.kenrockwell.com/nikon/300mm-f28-history.htm

Manual Focus:

1971 - 1976 : Nikon's first primitive 300mm f/2.8 ED super teles was impractical because it had klunky focusing and a manual diaphragm.

1977- 1982: Nikon 300mm f/2.8 ED-IF AI. This was the world's first practical super-speed super-tele, and very popular.

1982 - 1986: Almost identical AI-s version.

1986 - 2005: New version of AI-s. Same optics, but now focuses to 10' (3m) instead of 13' (4m) and has a permanently installed protective front plate instead of a 122mm filter thread. It weighs 3.5 oz. (100g) less than the previous two versions and is 1/2" (14mm) longer than the earlier 2 versions.

Autofocus:

1986 - 1988: First AF version, which was the manual focus Nikon 300mm f/2.8 ED-IF with a hole drilled up the side for the screw-type autofocus. AF was so slow that it was one of the reasons sports photographers changed to Canon, and have never had a reason to come back. Whoops! Slow AF is what lost Nikon the pro market. This first AF version is identified by a milled (fine-ribbed) glossy black AF/MF ring. The first AF versions focus as closely as their contemporary manual versions, 10' (3m).

1988 - 1992: AF-n version, still the same optics as the 1977 original and same slow AF as before. This version is identified by the coarse, crinkle-finish ribbing on the AF/MF ring; its ribs have about the same pitch as the focus ring ribs.

1992 - 1996: For the first time since 1986, Nikon put a focus motor into the lens, and for the first time since 1977, Nikon updated the optics. Nikon calls these lenses AF-I, for internal-motor autofocus. The 300mm f/2.8 AF-I focuses more closely than the previous AF versions, down to 8' (2.5m).

1996 - 2001: First AF-S 300mm f/2.8, which finally is the first Nikon 300mm f/2.8 which auto focuses quickly. It has newer optics than the AF-I version. This first AF-s version focuses as closely as the AF-I. It is the heaviest 300mm f/2.8 ever made by Nikon at 3.1 kg. It now takes a 52mm filter in a rear drawer, compared to every previous version which took a 39mm filter in a drawer.

2001 - 2004. AF-S II, which focuses a little more closely: 7.2' (2.2m) vs. 8' (2.5m) for the previous AF-S version. It also weighs less, 2.95 vs 3.1 kg.

2004: The Nikon 300mm f/2.8 VR adds vibration reduction for great results hand-held. This version focuses to 7.2' or 2.2m.

Dalla sigla parrebbe il 300/2,8 Af-s prima serie, che ho, ed � fantastico, probabilmente il migliore della serie; � stato sostituito dal seconda serie (lo puoi riconoscere dalla targhetta identificativa color ottone con scritte nere, il prima serie � al contrario con targhetta nera e scritte dorate) che va meno bene a tutta apertura ed infine l'attuale con stabilizzatore d'immagine che qualitativamente equivale al prima serie anche se qualcuno afferma funzionare un po' meno bene rispetto al prima serie, se usato con i moltiplicatori. La versione Af-i � anch'essa di ottima qualit� ma la velocit� dell'autofocus e decisamente pi� bassa.

Se il prezzo � buono e l'obiettivo � a posto prendilo senza pensarci; sono rientrato tre giorni fa dal Sudafrica dove l'ho utilizzato spesso con il TC17 a tutta apertura.....la nitidezza � da paura.

Ciao

Luciano