Rare Conversion: Factory Nikkor AI Conversion Rings

The back catalog of pre-AI/non-AI Nikkor lenses remains large on the used market but mounting non-AI lens on a nearly all modern Nikon DSLR/SLRs will result in irreversibly damage the camera. This is due to the solid non-AI aperture ring crushing the camera's aperture metering coupler/feeler tab. When AI lens and cameras were released Nikon originally sold factory AI conversion services and kits that would replace the non-AI aperture ring with a AI aperture ring for a set of lenses. In current day this Nikon service has long gone but there is another ...