BIG NEWS - Hands on with CONTINUOUS raw recording on Canon 5D Mark III In: Cameras Posted May 8, 2014 With the new EXCERIA PROâ„¢ CF cards from Toshiba do you know if we will have the ability to record RAW at 2K (2.35:1 ratio) with the 5D mark III? The 32GB Toshiba CF cards achieve a read speed of 160MB/s and write speed of 150MB/s. It is not the CF card write speed that determines the resolution and restricts us to 1920x1080? I felt that you would be the best resource to have a possible answer to this question. Thanks in advance.