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Yes, it is. And is compatible. The 70-300 is so commented because it has faster autofocus, less distortion and better build quality if compared to the 55-300. But you get drawbacks with 70-300: it's heavier and it's not a DX lens. It is originally designed for cameras like D700 and D3, called full frame (their sensors are bigger). On cameras like your D3100 and my D5100, the 70-300 is actually a 105-450. Lenses for full frame bodies work with their focal lenghts multiplied by 1.5 when mounted on DX bodies (like ours).
Sorry, there was a problem. Please try again later.The 55-300 is compatible with your camera and might be a better option than the 70-300 VR.
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