Bar, what made you get that particular lens? The reason I'm asking is because I have been debating between two lenses. The 100-400 and the 70-200 2.8 with the used of a 1.4x TC and/ or a 2x TC. I'm fully aware of aperture decrease which is fine, but I have read a lot of mixed reviews as to how much image degredation I will get with the 2x TC to get a focal lenght of 400. Bar, did you try this combination before making your decision on the 100-400 L lens? Nice shots by the way.
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