Verdict
The ES-2 Digitizing Adapter kit works well, but it feels overpriced for a collection of plastic holders and adapters, given that you will also need one of the three compatible macro lenses, but it does make use of the D850’s resolving power. However, a quality flatbed or dedicated film scanner can be had for less than the combined cost of an ES-2 kit and lens, though the scanning process can be much slower.