"The idea is to capture the flattest image possible with the most amount of detail and range of exposure possible. Given that the Canon 5Ds compress the video image (it’s not capturing RAW) – you need to make sure you don’t crush the blacks or blow out the highlights as you won’t be able to correct for that in post. You can always add contrast and saturation back to an image in post- doing the opposite is significantly more difficult especially off of the compressed file that the Canon 5Ds produce."Check out what both of these experts have to say. Here's Stu's article. And here's Vincent's.