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I thought the Nikon 12-24mm is a DX Format lens not FX, so it might not be your best option.
The other thing you have to keep in mind is that because DX format cameras have a cropped sensor, you will need a smaller focal length to get the same angle of view as you would on an FX format camera. So where a 24-70mm would be fine for FX it's not wide enough for your D5100. Perhaps the Tokina 16-28mm would be a better choice?
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