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I recently added the 400 f5.6 but haven't really had a chance to use it yet for it's intended purpose, which for me is wildlife.
I had to attend a school music program and usually grab the 70 200 2.8 but grabbed the 400 just to see how well it focused in horrible light. I kept the shutter speed probably higher than I needed causing the ISO to have to be high since I am accustomed to IS but I was surprised at the ability to focus quickly on the really dark stage all the way across the gym. I need to play with it to actually see how slow I go on the shutter speed and keep it under control.
I really am liking this lens. I was worried about the lack of IS but with the use so far and watching my settings it has not been an issue.
Canon EOS 5D Mark III EF400mm f/5.6L USM lens 400mm f/5.6 1/500s 12800 ISO 0.0 EV