Nikon lens designation for "Auto-Focus Silent" lenses with an in-built "silent-wave" motor

Introduced in 1996, the AF-S designation indicates that a lens has a built-in "silent-wave" motor, which provides faster and quieter focusing. AF-S technology was originally only available in professional lenses, but is now making its way into consumer lenses. The built-in motor allow these lenses to be used on Nikon bodies, such as the D3100 and D5100, which do not have focus motors.

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