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<blockquote data-quote="Atanu Dey" data-source="post: 81414" data-attributes="member: 11069">Traditionally when Nikon had film cameras with Auto Focus, they usually had a camera in the body and lenses were just AF (i.e without a motor). The modern trend is to have a lens which AF-S i.e with a motor in the lens (the so called Silent Wave Motor of Nikon). These lenses with motor are usually faster than the AF lenses and also more expensive. With D90, you will have to choice of using either an AF lens (using the body motor) or the AF-S lens (using the lens motor). With D5100, you have to always use the AF-S lens or focus manually. Coming back to your requirement where you need fast focusing / continuous focus mode, you are better off with the AF-S series lenses. I assume you will also need a decently long telephoto (70-200 may be) with a VR as well and those come only in AF-S series lenses. You can also go through the following link :<a href="http://snapsort.com/learn/lens-focus-motor" target="_blank">Lens focus motor - Learn - Snapsort</a></blockquote>

[QUOTE="Atanu Dey, post: 81414, member: 11069"] Traditionally when Nikon had film cameras with Auto Focus, they usually had a camera in the body and lenses were just AF (i.e without a motor). The modern trend is to have a lens which AF-S i.e with a motor in the lens (the so called Silent Wave Motor of Nikon). These lenses with motor are usually faster than the AF lenses and also more expensive. With D90, you will have to choice of using either an AF lens (using the body motor) or the AF-S lens (using the lens motor). With D5100, you have to always use the AF-S lens or focus manually. Coming back to your requirement where you need fast focusing / continuous focus mode, you are better off with the AF-S series lenses. I assume you will also need a decently long telephoto (70-200 may be) with a VR as well and those come only in AF-S series lenses. You can also go through the following link : [url=http://snapsort.com/learn/lens-focus-motor]Lens focus motor - Learn - Snapsort[/url] [/QUOTE]

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