Technically old-school film recorded movies done with the best cameras have effectively "unlimited" resolution.
Of course the reality is somewhat different and if you zoom in enough the image will still begin to appear "grainy" after a certain point.
well, it depends. the oldest of the oldest are, I think, 16mm film. That isn't so great for max resolution.
35mm has been around forever and is by far the standard, and that is basically what you are referring to. I recall that at "the dawn" of digital imaging, the ultimate goal was getting those 6 MP, which were the theoretical equivalent of "max resolution" of a full-frame 35mm film cell (what we now call "4k," I think). That was for fixed images, of course. recording moving picture shows at tolerable frame rate, at that resolution, obviously took a bit more time, but we're passed that now....well, maybe.
That's always a problematic comparison, though, because you still can't really measure the "Resolution" of cellular film media, as far as I understand it, because it isn't based on pixels or anything that is perfectly quantifiable. It's spongy. ....and then there is the issue that resolution isn't everything for image quality. It's really one of the last things, to be honest. Color accuracy, black levels, contrast, all of things are far more important. These are things that film stock excels at and still amends itself to incredible amounts of manipulation without and real data loss (a problem that digital will have every single time you make an adjustment--each tweak = data loss, quality degradation...mostly. RAW and modern equivalents are great, but they still have their limitation, I suspect).
There is also the ever important fact that whenever you record something digitally, you are forever locked by the digital formats quantified limitations. This is bad if you are interested in maintaining content for perpetuity and adaptable to future formats and demands. I probably have this wrong, but I recall the Star Wars prequels somewhat famously being fully digital sources and..I think maxed at 1080p with those very expensive Sony cameras at the time. Is that correct? That's fucking awful if true--no matter, really.
literally no one is interested in preserving
that content for future generation standards.
More relevant, I recall that David Gilmore's Live in Gdansk show was I think the first concert recorded fully digital...in GLORIOUS MINI DV FORMAT! YEAH! ALMOST DVD QUALITY! lol. what a fucking disaster. Totally useless the day it was released.
Anyway, cellular film stock amends itself to serious restoration without significant loss of "data" (e.g. PQ), as well as fresh digital scans (however that works?), to generate "pure" fixed resolutions for each scan. I'm honestly not sure what is going on with "8K", but we already know that every great 1080p and 2560p scans have been generated from the same original 35mm stock. I think I recall that it was determined, for some reason, that 4k isn't the "true limit" of 35mm, but maybe I'm pulling that out of my ass. I dunno
...OK and then there's 70mm film stock. Horribly expensive, but yeah, good luck everybody!
Also: Long live the GRAIN! I fucking love grain. Great films are only great when you get the sensation of looking through a sandstorm to see what is going on. Yes, I'm serious.
