7 Don’t Keep Taking (Duplicate) Photos
HDR, or High Dynamic Range, refers to a Camera feature that takes three photos in quick succession and blends them together for a better-looking picture. It’s a good way to get a nicely exposed and well-lit photo on-the-fly. But, by default, it can also be a space hog.
That’s because, normally, iOS keeps a copy of the original, non-HDR photo. If you use HDR a lot, that means you can end up with tons of what are basically duplicate photos. If you don’t need the non-HDR shot, then just go to Settings > Photos & Camera, and turn Keep Normal Photo off under the HDR category.