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Message: <blockquote data-quote="aroy" data-source="post: 283469" data-attributes="member: 16090">The simplest difference is that the "D" lenses have no inbuilt motor, hence cannot AF on the lower end bodies. That apart some D lense with AF-S prefix have motor. G lenses have no aperture ring.The reason for the D lenses being cheaper is two fold. One they are older design and hence (supposedly) cheaper to manufacture. Two they have no motor, which obviously reduces cost. Normally when a D lense is upgraded to G lense all the modern features are added - motor, VR, ED glass and nano coating to name a few. All these increase the cost.</blockquote>