In Live View, this set the size of steps used when manually focusing. Larger step sizes cause the focus to move faster and have less granularity in focusing. A focus step size of 20 is a recommended starting point. The step size can vary from 5 to 500.
With some lens and camera combinations, settings of less than 15 for the focus step size can result in no focus movement - should there appear to be no focus change please increase the step size.
The Manual Focus Step Size is also used with Focus Stack Shooting. The size of the Manual Focus Step is used as focus step size for each focus stack shot. As with Manual movement, some lens/camera combination do not respond well to small focus steps and some trial/experimentation should be done with your camera.
NOT supported on D40, D40X, D60, D80, D200.
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