In the last 3 hours I've been experimenting how custom render pictures work internally in comparison to the ingame render and this is going to be a long posting that will probably takes another hour to write down with a lot of tests and comparison pictures and explanations of why so many people have problems with zoomed in and way too big pictures.
Long answer short, the implementation is, like most stuff with 2K, amazing on paper but far behind their potential implemented, cause in-game re