...I don't remember seeing any dramatic differences in vignetting.
As I remember vignetting of the 200/4.0 IF Micro was not an issue close-up, rather at normal distance and out to infinity. I wanted a 200mm close-up lens that doubled as a standard 200mm telephoto.
I'm guessing to much here but I think stopping to f/5.6 is quite helpful and f/8.0 fixes the problem.
I mostly used this lens for closeups with or without a no 3T closeup filter and/or PK-13 extension tube.
I made a lens cradle to use the 200/4.0 IF Micro with a PN-11. Due to the angle of the AI version's tripod collar I could not tighten the system too firmly. I can't remember specifically but I probably didn't tighten the PN-11 collar fully. I may have use a 1/32" automotive gasket material on the leading edge of the lens tripod collar to align the group better and reduce binding. Anyway I will only recommend the AIS version.
The problem with the Ai and Ai-s was the presence of lots of LoCa.
Using Panorama Tools with Photoshop 7 cleans up the CA issue completely or pretty well. (I'm going on memory here
. I can't remember developing NEF from my 200/4.0 IF Micro with Capture NX-D. NO SUCH LUCK:
The cleanup today might be automatic in CNX-D. I need to give the 200/4.0 IF Micro a spin on my D850.
My feelings towards the 200/4.0 IF Micro are generally good. Focusing with the If was great, just a touch with the finger tip was all that was needed. Portability of this lens is great.
Dave
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I forgot this (4T v. TC300/301)...
"It's much better, and simpler, to use the close-up lens 4T for attaining this magnification. Note however that 4T must be mounted in a reverse position in order to give good image quality (the AF Micro 105 behaves in the same way). This is easily achieved by mounting 4T onto a 52/52 mm thread reversal ring." --http://www.naturfotograf.com/lens_spec.html"The reason why reversal gives better quality is likely linked to improved control of spherical aberration. Alternatively, the close-up lens is designed to correct field curvature, but a Micro-Nikkor is designed as a flat-field lens so adding a close-up lens might overcorrect thus creating unsharp corners. Try out for yourself." --http://www.naturfotograf.com/lens_spec.html
There is a wealth of information at
http://www.naturfotograf.com/lens_spec.html I've consulted these pages many times before buying a lens.
Dave
A thousand candles burn out, still I edit my post!