Seeing as we've transitioned into talking about the D800, can somebody explain to me what exactly "uncompressed HD signal out" means?
I've seen people talking about this all over, but nobody explains what it actually is and what it is useful for. As far as I'm aware, signal sent through HDMI is already uncompressed. So what is the all the fuss about, or is it a one of those features that nobody has any idea what it is and just brags about it?
For someone with the equipment to handle it it means you avoid some cheap on the fly compression adding posterization, blocking, robbing details, etc. Granted for the avg guy on the street it's somewhat just bragging rights. Although if you have the right device you might be able to grab it onto a laptop in the field and if you stick to short clips and then re-compress might not overflow your HD.
It could be nice for avg guy, at times, but generally it would be much more of a serious pro thing.
(I am assuming they are sending the video, as captured, out over HDMI during live filming, all the frames, non-skipped and before the internal compressor compresses it into h.264 or whatnot. Hopefully that is not a false assumption.)
And it would allow for better live monitoring, it won't be down-rezzed, or have frames skipped, or have had anything meddlesome done. I think the current DSLRS all did some combinations of those things during live previews. I have to say I haven't tried live preview of HDMI out yet so I'm not sure exactly what they are doing. I do know that you certainly can't get 1920x1080p full frame rate all frames with zero compression out of any of the Canons.