Ryan at San Jacinto. He uses my D7000 and 70-300, i tried him with my old 50-500 but he still cant hold it steady.
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Hey, this guy is very very strong holding the big camera with BIG lens (is that a 800mm one?) seemingly very steadily without even putting elbows on the bridge for support! No tripod or monopod, and hang a big backpack behind... I am not sure I can do like that with my sigma 150-600mm C for very long time.