You don't need
10x the amount of data to learn. Nothing about this—i.e. LOG and/or LUTs—is in any way unique to ProRes let alone the iPhone.
but if you shoot in Log and then use Apple LUTs, why even shoot in log in the first place?
If you understand what recording LOG means and what LUTs are for, then it makes perfect sense. For some, but not
everyone! Nothing that can be usefully explained in just a few sentences. But common sense will tell you that if it were nonsense or useless or contradictory, Apple would hardly implement it nor would the pro fraction of shooters be abuzz over it, no?
Short version: shooting LOG
without an appropriate and correct LUT is much more nonsensical,
not the other way around. And yet, yes, it is still done all the time, I know, and is fine if you know what you're doing otherwise. That's what this age of post-/production brings with it. People pick up random snippets, terminology, and techniques that sound cool and "pro" without understanding even the first thing about what comes before it or
why or
what it is, etc. Along the lines of "
if I do/say/use this I'll be 'pro'".
I'd like to be able to adjust the exposure with as much data as I can.
That has little to nothing to do with this. As far as that's concerned you're on
100% equal footing whether you shoot ProRes or HEVC in LOG. This is about
dynamic rage, your
exposure is baked in no matter what. So I'd say you're trying to start somewhere randomly at the top of the chain without having understood the very bottom and everything in between
first. I would reconsider, if you in fact want to learn something.