http://www.nikonchat.com/g-or-d-af-nikkor-lenses/
What do these letters in Nikon lenses?
AF-S VR Micro-Nikkor 105mm f / 2.8 G IF-ED AF-I Nikkor 300mm f / 2.8 D IF-ED I know that the media AF AF and the VR vibration reduction means, but what do the letters "S,-I, if and ED? Also after the number or f is a D or G, what do they mean?
AF are older autofocus lenses that require the camera body to have an internal motor Auto Focus AF-S is the new ultra-high speed auto focus lenses have autofocus motors in the lenses. ED is a special optical glass that reduces lens flare and ghosting. The G lenses version does not have an aperture ring external control. IF is internal focus which means that the element front of the lens does not rotate as the focus of the lens. This is important if you are using a polarizing filter Here is a link that should answer the questions that still have to be determined. http://www.kenrockwell.com/nikon/compatibility-lens.htm
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