Originally posted by falconeye That was true in the past but isn't anymore. Sony's NEX VG10E changed it.
Yeah, only that the VG10E isn't really a proper camcorder, IMHO. It doesn't have power zoom, it is imbalanced with the superzoom lens in front of it, it doesnt have any kind of focus confirmation, it has no zebras or blinking highlights. And at least some of these are inherent in the system, meaning there won't be a camera that does all of this (making it a proper video camera) in the Sony NEX v1 System. Others are just shortcomings of this particular model, probably because it was designed more by their stills than their video division.
It's an EVIL still camera in a camcorder's housing. Of course, it is an indication of where things in the upper amateur and lower pro market are heading (again, IMHO). I think every proper SLD system is going to include at least one movie-optimized body like the VG10E. But it's not a much more competent movie camera than a proper VDSLR. Maybe even less so than a Sony A55v.
You're right, of course, that a pure video camera doesn't need a mirror, and has no use for an optical viewfinder. But video in a DSLR, for many amateurs and "prosumers" is also about having a very high quality video camera along with their very high quality stills camera, without twice the expense, twice the weight, twice the bulk. In any case, video in DSLRs is here to stay, and going to get better.