Before purchasing my C300 MK III, I had searched extensively for information and reviews for the two available EVF's, but had not found much at all, in fact, pretty much nothing. My primary interest had been in the EVF-V70, due to its resolution, but it cannot be used along with the LCD, since they connect to the same port. That left the EVF-V50 as the only remaining Canon option, as it connects to the extension port on the rear of the camera.
While I have used the EVF-V50 for less than a full day, it solves the anticipated and experienced issue of bright sunlight obscuiring the LCD. I would not recommend it for critical focusing, but for framing, which is my intended use, it should be just fine. I had expected that it's proximity detector would turn of the LCD's screen, but it does not appear to do so—unless I have overlooked an in-camera setting—and it remains engaged when removing one's eye from the EVF. That said, it does come with a occluder that fits into the eyepiece, which I sure will get lost as time goes by. But for the difference in cost, $700 vs $4,000, it is a worthy EVF contender.
