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It is a prime lens which means it does not zoom.
Sorry, there was a problem. Please try again later.The D3100 does not have a focus motor. It would require lenses that have a built-in focus motor. Nikon denotes these lenses with an AF-S designator. This means the lens has Nikon's Silent Wave Focus Motor built-in to it. It will be compatible with the D3100. It is a FIXED FOCUS lens, hence it does not zoom.
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