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David Baldwin wrote:
"Once the EVF and autofocus improve, the flappy mirror will be an ancient relic to be eliminated."
For small cameras the mirror is a pain. But for larger formats the mirror is cheap and effective, there's a good reason that this Victorian technology is still around - it works!
For larger formats, like full frame bodies, electonic viewfinders are a solution in search of a problem, pretty much irrelevant, a toy. I want an absolutely real time view of my subject, not an approximation.
The mirror/prism/finder assembly (plus submirror and separate autofocus sensors) is one of the most expensive components in the camera, and isn't plummeting in price with improving technology. There's a reason that 100% coverage pentaprism viewfinders are only found in high-$$$ models, and not thrown in as freebies in entry-level cameras. Furthermore, the design necessity of clearing the mirror accounts for a large fraction of the size/weight/cost of lenses wider than ~50mm --- you can make fast, wide-angle lenses a lot smaller and cheaper for the same image quality without the mirror clearance requirement.
So far as "problems" for EVFs to solve, they can provide instant feedback on how the real dynamic range of the scene will look when compressed into some target output space. Without needing to wait for the mirror, shutter lag can potentially be even shorter than the fastest SLRs, giving even better "real time" capability for precisely timed shots. Also, no noise or mirror shake for scaring away wildlife and blurring images.
Present-day EVFs aren't fully up to the standard of the best optical viewfinders, but for guessing what Canon's future plans are, the inadequacies of current EVF's are practically irrelevant compared to the rate of improvement (which is substantial, and points towards "better than real light" EVFs in the future).