Kenko intermediate rings with the transfer of automation that are designed to allow the lens to focus at a distance closer than its minimum focusing distance. 

Intermediate rings with AF and exposure are equipped with contacts transferring all information about the exposure parameters to the camera body. All automatic camera modes will work with them. For newer lenses equipped with an AF engine, it will also work. Older lenses in which the AF drive is transferred by means of a mechanical clutch will work in manual focus mode.

The MK-N-AF1-B adapter  ring set is equipped with contacts transferring all information about exposure parameters to the camera body. This means that all automatic camera modes will work with them. New lenses equipped with an AF engine will also function. In contrast, older lenses in which the AF drive is transferred by means of a mechanical clutch will work in manual focus...