Josh, lovely shots. Does your iPhone have a 'Pro' function buried in the menu system? I've got a Nokia XR20 (Android), so not top-end by any stretch, but in the Pro menu I can set the phone to take shots in RAW (DNG) format. This does mean further work on the computer, but it also means awkward shots of bright highlights and dark shadows can be managed better. I took this one in Boothlee Pipe, high up in Millers Dale a few weeks ago, handheld, in pretty low light - it definitely required some more work in Photoshop, but it handled the very bright daylight and shadows far better than the default 'pseudo HDR' setting could.
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