It is very hard to compare a D5100 and D300.Nearly everything about them is different and not made for the same purpose.However, many of the same components are shared with the D7000 including the Sensor.The D7000 has a metal body, better sealing, dual card slots. bigger battery and many more controls.The D5100 is cheaper, smaller, lighter, has a very good articulating screen and shoots HD1080 video at 30fps.
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