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" d " & " g "
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<blockquote data-quote="fotojack" data-source="post: 3308" data-attributes="member: 16"><p><strong>D</strong> — 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.</p><p><strong>G</strong> — Designation for lenses without an aperture ring, indicated after the f number<a href="http://en.wikipedia.org/wiki/F-stop" target="_blank">http://en.wikipedia.org/wiki/F-stop</a> 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<u> gasket</u> around the mounting flange. G lenses otherwise have the same characteristics as D lenses.</p></blockquote><p></p>
[QUOTE="fotojack, post: 3308, member: 16"] [B]D[/B] — 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. [B]G[/B] — Designation for lenses without an aperture ring, indicated after the f number[URL="http://en.wikipedia.org/wiki/F-stop"][/URL] 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[U] gasket[/U] around the mounting flange. G lenses otherwise have the same characteristics as D lenses. [/QUOTE]
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