I CONNECT THIS LENS ON MY D5100 BUT THE LENS DOES NOT ZOOM AUTOMATICALLY WHAT ARE I AM DOING WRONG.
No Nikon lens ever zooms automatically, so I assume you mean focus.
The D5100 lacks an autofocus motor, requiring the lens to have one. The older 70-300mm lenses lack this motor, expecting the camera body to have one.
The D5100 will only autofocus with lenses designated AF-S or AF-I. It will not autofocus with older AF-D and AF-G lenses.
SOURCE: zoom on nikon d5100
In either mode, you're zooming by turning the zoom ring on the lens? In live view mode, if you zoom in by pressing the magnifying glass button, all you're doing is zooming the display, not the image itself.
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