Vello Nikon F to C Mount Lens Adapter LA-C-NF B&H Photo Video
C Mount to Nikon F Lens Adapter | eBay
C mount - Wikipedia
Amazon.com : Fotasy Nikkor Lens to C Mount Adapter, F Mount Lens to 16mm Cine Mount Adapter, Compatible with Nikon F Mount Lens and Cine Movie Making System/C Mount CCTV Camera/C-Mount Microscope
Urth Contax/Yashica to Nikon F Lens Mount Adapter | Urth US