The Lord of the Rings trilogy and The Hobbit trilogy are both now available on 4K for the first time ever, which means that director Peter Jackson had to go back and go through all six films to get them up to snuff. In a new featurette, Jackson explains that the biggest problem he had was inconsistency – the six films are meant to tell one huge, linear story, but since they were all shot at different times on different kinds of cameras, they all looked different. But that’s changed.
Source: https://www.slashfilm.com/lord-of-the-rings-4k-restoration-featurette/