Canon G1 X review at The Verge

"The G1 X has a rangefinder-style optical viewfinder that's much like the one on the Fujifilm X10, and my opinions of both are much the same: it's a radically different way of framing a photo than with a through-the-lens viewfinder (which is what you get on every DSLR), and what you see isn't exactly what you get (which is good, because you can see the lens through the viewfinder, and

you'd probably rather not have that in all your photos). The G1 X's viewfinder isn't quite as clear or sharp as the X10's, either, but it is a little easier to use since it's located closer to the lens, so what you see is a little closer to what the lens sees.

 
There's no information displayed on the viewfinder, and though it zooms with the camera it doesn't focus with it — with a rangefinder everything appears to always be perfectly in focus, whether it is or not, and that can definitely cause some problems since the G1 X's autofocus isn't particularly reliable (I'll get to that in a second). It also doesn't show the entire frame, only offering about 80% coverage. As with the X10, a rangefinder can be great once you figure out how to use it, but most casual users (and many DSLR users) won't know how. The G1 X's viewfinder also isn't nearly as high quality as Fujifilm's, which is so good and so clear that it might be worth the learning curve."
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