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Taken with a 1DMKIII, 600mm f4L IS lens and 1.4X TC in Yellowstone back in May.
I have been to Yellowstone ten times altogether and this trip (and another in June) were my first with a 600mm. My Gosh, what a diffference! There were shots that I wouldn't have been able to get nearly as well with a 500 that were great with the 600. I was very impressed. Even as heavy and awkward as it was, it was well worth the effort.