olegam

In order to retain image quality when using close-up lenses on AF Micro Nikkors (and possible also the MF 200/4 Micro Nikkor) it is advised to mount them in a reversed position.
A thread reversal ring is then needed. I could not obtain one and solved the problem with two Cokin filter rings glued together. The reason why reversal gives better result is said to be improved spherical aberration.