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No CFast sucks, but what really grinds my gears is UHS-I. Since you could use a UHS-I or II card in a UHS-II slot, the only reason I can see for this is that Canon DESPERATELY don't want ML hacks allowing for great video. I was really hoping for media options that could allow for 4k Raw video. It also means that the image buffer is (pathetically) small.

USB3, on the other hand, allows for theoretical transfer speeds of up to 640MB/s, and since RAW video fills a card so quickly anyway, perhaps ML could allow for tethered video shooting where the video is saved straight onto a laptop via USB3. Is there a reason this couldn't work?

KelvinK, do you have a reference for the 5D mark IV not supporting UHS-II in its SD slot? Such as a link to where those specifications are from. Canon Rumors don't specify the speed, and I haven't found its speed mentioned in any of the other rumor locations, but this really is an important feature (to be UHS-II) and I would really hope Canon would include it.

The 5D mark iii didn't support UHS-I and was limited to 133x (20MB/s), which is why it is so important to use CF cards. The 6D was released later and supported UHS-I, and card tests at the time showed many cards transferring at 35-36 MB/s. UHS-II has been released and the fastest SD card I can find is the Lexar Professional 2000x UHS-II SDXC which is 300MB/s. As opposed to available CF cards max speed of 160MB/s.

That same SD card in tests has shown extended write speeds of 250MB/s. For a camera that doesn't have CFast 2, to me this would be an acceptable downgrade and if ML can produce Raw 4K, then I would definitely like the fastest card available. UHS-I makes me cringe!

I have a 4K monitor and although I mostly take photos, I would also like to create landscape screensavers, such as waves crashing on rocks etc. So I'm really looking forward to what ML can do with the 5D Mark iv. I'm not sure how I can contribute, but I would really like to.