Shooting with 5D MKIII in RAW

How can i shoot with 5D MKIII in Full RAW resolution? I did a quick test and when it exported full HD PNG Files instead of full res RAW files. Then i checked the camera to realise it didn’t save any RAW files at all. I need the RAW files for post cropping and heavy grading for a job. Please help

iStopMotion creates an 8 bit movie, so it flattens RAWs down to 8 bit PNGs. We have plans to switch to an image based document format in the future but for now there is no possibility to use the RAW files in iStopMotion, sorry.

That’s fine… but why does it prevent the camera from saving the RAW files?