Why do camera bodies and some lenses both have autofocus / manual switches?

by John MacMaster   Last Updated June 14, 2018 14:18 PM

Why is it that lenses come with an AF option when the camera has the same? Which controls the AF? One would think that they contend with each other for control. Why have two entities doing the same single task? A photographer friend of mine said to set the lens to Manual. If every photographer does why offer lenses with this setting?

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