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Title: Poor Choice
Review: I read every review and test I could find while deciding between this lens and the 70-200 f4 L. In the end, I opted for stabilization and reach - big mistake. Sharpness and color are poor on this lens and it can be very frustrating when you review your photos at the end of a trek and toss, literally, all of them. I sold this lens at significant loss and bought a used 70-200 f2.8 L (non IS). The difference was stunning. There is a reason the f4 is best in its class, don't make my mistake. You can easily crop your super sharp photos to match the reach of the 70-300. I've since bought a used 400mm f5.6 L - even at f5.6 the L glass is so superior to other products that it is easily hand-holdable (this lens is non IS) in all but the lowest light. Additionally, the L lenses are built like tanks! The f4 L will not dissapoint, buy it.
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