I know there has been a lot of talk regarding the high ISO ability of the 5DIV. Unless I'm shooting during twilight I almost never see anything above 200 anyway, so historically that hasn't mattered to me a lot. On the few occasions I've used higher ISO's previously I have never been too happy with the results. I got out over the weekend and tried something (needed to basically due to high water flow) and shot this image at ISO 800.IMAGE LINK: https://photos.smugmug.com …02-170415-X2.jpg&lb=1&s=A
Now, I'll have to say that when processing the image it took quite a bit more work than I typically have to do. I noticed a loss of detail in some of the elements that are further away, and of course there was more noise to deal with, particularly in the darker shadow areas. With shots like this, I typically have to pull up the exposure overall a decent amount, and the shadows even more to keep from clipping portions of the water.
Overall I'm pretty impressed. While I had much rather have this image at ISO 50-200, it ended up being very usable. I certainly wouldn't want to go that high unless I needed to, but it has the ability.
I realize this doesn't apply for people shooting subjects that typically need the quicker shutter speeds, but for a landscape image I find this pretty impressive from an image quality standpoint.