" d " & " g "

fotojack

Senior Member
D — Distance. Indicated after the f number in the name, and also occasionally designated AF-D. The lens electronically communicates focus distance information, which is incorporated into the camera's exposure calculations in 3D Matrix Metering mode, and also D-TTL and I-TTL flash autoexposure. All AF-I, AF-S, and G-type lenses are also D-type.
G — Designation for lenses without an aperture ring, indicated after the f numberhttp://en.wikipedia.org/wiki/F-stop in the name. G lenses retain the mechanical diaphragm coupling of other Nikkors, but it must be controlled by the camera body. Only autofocus bodies with command dials are capable of controlling G lenses. Older autofocus bodies will work with G lenses in shutter priority and program modes with full opened aperture. Some recent G lenses feature a weatherproofing gasket around the mounting flange. G lenses otherwise have the same characteristics as D lenses.
 
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