In Live View mode this control determines the rate at which the manual focus will change. The Slow, Medium, & Fast settings start out changing at a low rate and then accelerate the change the longer the "Focus In" or "Focus Out" button is held. This allows both fine tuning + rapid movement when focusing. The Slow setting uses a more gradual ramping up of the change the Fast setting, with medium in between. A good point to start is in medium.
The Fixed setting moves at a constant rate. This would most typically be used in very focus critical application to most finely tune the focus.
Both the fixed and variable rates are adjusted by the Focus Step Size.
NOT supported on D40, D40X, D60, D80, D200.
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