To the best of my knowledge: HDCam can't do 24p. It can only do interlaced. Also, it only does 3:1:1 color at 1440x1080p which is up-resolved to 1920x1080p. It can hold only four channels of audio. The bit rate is 135Mbps. HDCamSR can't do 24p either. It can only do interlaced. It can do 4:4:4 RGB color at 1920x1080p and can do more than 5.1 channels of audio. The bit rate is 440Mbps standard mode and 880Mbps HQ mode. It also has a better compression algorithm and smaller metal particles than HDCam. So, neither HDCam nor HDCamSR does true/native 24p. But, there is a way to "trick" HDCam and HDCamSR into recording and playing a true 24fps (24p) image. This is called psf, or progressive segmented frame. (This is also why I wrote above that both HDCam and HDCamSR do 1080p instead of 1080i). HDCam/HDCamSR 24psf divides a single whole image frame into two individual half frames - one with odd lines and the other with even lines. The odd lined frame and the even lined frame originate from the exact same moment in time. When the odd and even psf frames are combined, they make one full image frame. By using 24psf, HDCam/HDCamSR can store and play 24p media without adding false frames and can play the media on interlaced-based media equipment. Basically, it makes 24p films able to be played on interlaced and also progressive players. The two frames can be merged together to make a perfect whole frame image of a single instant in time. Psf is different than interlaced because, with interlaced, the two frames (one of odd lines and one of even lines) do not originate from the same moment in time. On the other hand, the two psf frames do originate from the same moment in time. This makes 24psf video vastly superior to interlaced video for storing and playing 24fps (24p) media. HDCam/HDCamSR 24psf is a legitimate way to capture, store, and play media that originated at 24fps (24p). Of course, HDCamSR is more desirable than HDCam given the better data rates, color space, compression algorithm, and amount of sound channels, not to mention true 1080p resolution instead of up-resolved 1080p with HDCam. The above information regards the current generation of HDCam/HDCamSR. I believe that the first generation of HDCam was not able to do 24psf, but could only do true interlaced....but I am not 100% sure of this. So, the master could be on HDCam at 24psf or HDCamSR at 24psf or possibly a wide variety of other forms of media. I really have no clue where Criterion got the master to their current Blu-ray release from, nor have I seen the new Blu-ray release of this amazing film, but I hope to see it soon. I just wanted to add some information to the HDCam/HDCamSR debate. Best wishes.