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the 150-500 is the best of the 3.... the 50-500 is a bit soft, the 170-500 doesnt have OS or HSM.. so its big, heavy, slow focusing and long f/l (ingredients that do not mix together well.)
150 can be limiting at times.. this is where it pays to have 2 bodies... 70-200 on one, 150-500 on the other
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