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    Nikon AF-S 300 f4 vs sigma 120-300 f2.8 NO os

    Mark, the 300mm f4 is very light and slim by comparison to the Sigma. Both have excellent IQ and the Sigma has the zoom facility. Weight/size versus zoom range. Your choice. One other factor is that the nikkor will be compatible with the Nikon V1 and is very good , but not sure about the Sigma.
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