I just did a quick and dirty investigation of color fringing with the 200mm f/4.0 IF Micro-Nikkor on my D850. A careful test is not indicated. Red-Green color fringing outside of prime focus with the raw lens at 1:2 is unpleasant and color fringing is worse with a reversed Nikon 4T close up lens. The target was a scared brash garden hose nozzle. The subject was back lite and the light was somewhat softened sunlight coming through a translucent deck cover. The color fringing was observed in the center of the frame. The fringing was red before and green after prime focus. ***I'd appreciate someone with more technical knowledge commenting.***
With Nikon's Capture NX-D, Axial Color Aberration correction feature set to 100 the color fringing is mitigated some but not nearly enough. This is a deal breaker for me. I will not be using the 200/4.0 IF Micro-Nikkor for close-up photography with my D850.
Performance at a distance of 2.5 meters seems good. I'll have to do more testing. Ken Rockwell's vignette test show vignetting wide open at infinity and something like 1.5 meters of about what I remember or less. It's not hard in the corners like a 50/1.2 AIS Nikkor at f/1.2. I would think it is correctable and stopping down to f/5.6 reduces it to a level that shouldn't bother me. The transition is soft enough that it might serve to center the eye on the center of the frame. I often use Photoshop's Lens Distortion Correction, Vignette Feature to give a subtle false lens vignette to place emphasis on the primary subject.
This is the first time the 200/4.0 IF Micro has been out of storage in a long time. The last time was when my D800 was new and I only remember shooting subjects at a distance of maybe 2 meters and greater. If the price is right the 200/4.0 IF Micro may make a pleasing 200mm f/4.0 general use telephoto. The IF focus is as slick as I remember it.
Again I won't be using this lens for close-up to macro with my D850. I hope someone will give the 200/4.0 IF Micro a spin on a modern Nikon DSLR and confirm that I'm not talking trash.
Dave