How to use ML 4K firmware shoot 4K video on 5D III?

[eemin]

I downloaded the latest 4k ML firmware on my 5dIII. When I choose the crop mode UHD 1:1. the priview is broken( as mentioned in the menu). If I start recording without raw file. The mov files are also broken. how can I shoot footage in UHD mode? Anyway to let me see the preview??

[Levas]

If preview is broken, the only way to go is raw recording.
If preview is normal, you can record in standard mov format.

If preview is broken, you probably can see a preview created by magic lantern, by holding the shutter button on half press.( I think that's the default option, otherwise you need to select this in raw video menu).still the only way to record this is in raw format.

[eemin]

Thank you Levas, now I understand how it works.