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Message: <blockquote data-quote="hollis_f" data-source="post: 1633227" data-attributes="member: 14566">With a much slower AF system and a sensor that overheats after a short time (see reports of 5DII and 7D video).If you want to use phase-detection autofocus then you need to divert some of the light to the AF sensor. That either means a mirror that has to flap out of the way, or a loss of light to the one place you really need it - the sensor. Contrast-detection AF (as used in the live-view Live Mode focus method) is a lot slower than phase detection. And probably always will be.Then you have the problem with thermal noise. When sensors get warm they produce more noise (which is why big astronomical CCD are cooled to a few K). Maybe when we have room-temperature superconductors we can have sensors that aren't affected by thermal noise. But, until then, we're faced with the fact that having the sensor always-on is going to cause big problems.So, yes, the death of the dSLR is imminent. As soon as we have contrast-detection AF that is as fast as phase-detection (which means a dedicated chip about 100 times faster than a Digic 4) and we've invented room-temperature superconductors that can be used at nano-scales.I ain't gonna be doing any breath-holding.</blockquote>