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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.
The Sunpak PZ 4000 and 5000 were made for film cameras. I have one for
my EOS film cameras. It works just fine. I know this series of flashes
was not made for the digital cameras. It likely will not harm your
camera if the flash is designed for your camera brand. But some functions will not work.
For example, do not use a flash for Minolta on a Nikon.
You risk damaging your cameras electronics or frying the flash.
Get their PZ 20, PZ 30, PZ40 or PZ 42X for your digital camera.