Products like glass plates as made by people like Jason Lane are stone-age technology compared to film-coating at an industrial scale. The processes are basically incomparable. Btw, this is also true for lens and optical assembly manufacturing; such processes and the required knowledge and competences are incomparable to those involved in film manufacturing. The similarities are only at a very high level of abstraction - so high, in fact, that the practical implications are very limited.
Ah, right, I was just looking for some point of comparison, in terms of what "scale" they can accomplish based on what they've said. There are a number of small companies that have spun up manufacturing for photographic lenses, part of which can be offloaded to a third-party, but at the very least making the lens barrels in-house is doable. Lens rehousing for cinema lenses, for example, requires that infrastructure. However, since LLL say they use no third-parties, I imagine they
are doing manufacturing of the optics in-house, which seem pretty impressive by comparison to just lens barrels and mechanics and assembly, no? Just those things alone are impressive too. Again, even as you mention, that is
very different from manufacturing film, but in that area LLL
does seems to have proven themselves very advanced!
So, I haven't heard of people making photographic
film as a startup or as hobbyists, so glass/tin plates vs film is another matter, but the thing about making emulsions alone is a jumping-off point. What separates the simplest B&W films sold now to the most complex amateur emulsions? Quality control? Arcane sensitizers?
I imagine it still isn't as simple as "passable emulsion + acquired film coating infrastructure = new film business"?