Joshua Holko
Nature and wildlife photographer Joshua Holko was lucky enough to spend some time with the yet to be announced EF 200-400 f/4L IS 1.4x lens.
Below is a video review with Joshua talking about the lens. I'm travelling home at the time of writing this, and streaming capabilities are minimal so I cannot summarize. From what others have said though, it is receiving high praise for its performance.
Enjoy the video
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