The 5D Mark III will go all the way up to 12800 in video mode. Shoot at a high ISO and you can expect to get some noisy video but it might be acceptable for the right project. Canon really should be commended for its commitment to picture clarity, as they've been smart to keep the megapixel count under control. Well it's raw video so chroma subsampling doesn't really apply. It looks pretty good fore 1080p but sharpness is far from a good 4k camera. Really depends on your needs and what your comparing it too Also the ml workflow is a pain. Huge data rates, so you probably want a few 256gb cf cards as each card only holds a hour of footage. I did come across this video with some slow mo shots in it: Here the poster claims they did a 1920 x 1080 full HD 60 fps in the description, using a Canon 5D Mark III with magic lantern. In the comments, he mentions that if your card is fast enough, it can do 10 seconds of slow mo as he was able to. However, I don't see anything online to Approx. 850 shots. Approx. 180 shots. REFERENCE. The figures above are based on a fully-charged Battery Pack LP-E6, no Live View shooting, and CIPA (Camera & Imaging Products Association) testing standards. The actual number of shots may be fewer than indicated above depending on the shooting conditions. Pressing the shutter button halfway for
EOS 5D Mark IV (WG) - gdlp01.c-wss.comIf you are looking for a comprehensive and detailed user manual for your EOS 5D Mark IV camera, this is the pdf file you need. It covers all the features and functions of the camera, as well as how to use the Wi-Fi (wireless communication) functions to connect with other devices and services. Download it now and get the most out of your EOS 5D Mark IV.

All bought from reputable retailers like B&H, Adorama, etc and all of them have worked flawlessly on other cameras like Sony and Panasonic shooting 4K video. On my Canon 5D Mark IV I wouldn't even be shooting 4K, am only shooting 1080p footage and this still happens. I remember it happening even on my old 5D Mark III with some SD cards as well.

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canon 5d mark iii 4k video