I have a 5D mark 2, and i work with vegas pro 10, and yes it support hdslr footage in the form of mov h264. But i still like to trans code to the Avid coded DNxHD, which is a FREE download from Avid site. this codec is supported by PC, & Mac, which products a data stream @45MB/s 29.97Fps or 36MB/s 23.97 1080p. Avid DNxHD, which stands for “Digital Nonlinear Extensible High Definition”, is a lossy high-definition video post-production codec engineered for multi-generation compositing with reduced storage and bandwidth requirements. It is an implementation of SMPTE VC-3 standard.[1] DNxHD codec was developed by Avid Technology, Inc. It is comparable with Apple’s ProRes 422 which uses similar bit rates and has the same purpose