Canon releases a product advisory for the EF 400mm f/2.8L IS III and EF 600mm f/4L IS III

Canon Rumors Guy

Canon EOS 40D
CR Pro
Jul 20, 2010
From Canon:
We would like to inform you of the firmware for the interchangeable lens “EF 400mm F2.8L IS III USM” and “EF 600 mm F4L IS III USM” for SLR cameras, which will be released soon.

Canon EF 400mm f/2.8L IS III USM
Canon EF 600mm f/4L IS III USM

The following fixes will be incorporated into the firmware (Version 1.0.8), which will be released soon.

Corrects the phenomenon where the exposure may flicker slightly if recording a movie with the camera shooting mode set to M or Av in combination with select cameras*

* EOS-1D X Mark II, EOS-1D X, EOS-1D C, EOS-1D Mark IV, EOS 5D Mark IV (Ver. 1.0.2 or later), EOS 5D Mark III, EOS 5D Mark II, EOS 5Ds, EOS 5Ds R, EOS 7D Mark II, EOS 7D, EOS 6D, EOS 80D, EOS 60D, EOS 60D, EOS 60Da, EOS 8000D, EOS Kiss X 90, EOS Kiss X 90, EOS Kiss X 80, EOS Kiss X 50, EOS Kiss X 8i, EOS Kiss X X7i, EOS Kiss X7, EOS Kiss X6i, EOS Kiss X5, EOS Kiss X4...

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Jul 21, 2010
My guess would be almost certainly the later.
Hope so, for the users' sake. I'm less certain – as @tron pointed out, the MkII superteles had to be sent in for the post-launch firmware update, and that was after Canon pushed out the firmware update for the 40/2.8 pancake that users could install themselves with newer camera bodies.
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Canon 40D & 7D
CR Pro
Sep 9, 2014
And I think the amount of people who use a 400 or 600 for video is very slim. The 200-400 would be a better choice for video I think.
I think the Sigma 200-500mm f2.8 would be the best super-telephoto zoom for video... nice and heavy so when mounted on a hefty tripod setup, fairly stable (don't use in high-wind though). And that lens will only set one back about $29K USD... ;-)
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