K&F Concept Mount Adapter M42 to Nikon F Mount, M42 Mount Lens to Nikon F Mount Camera Adapter, Lens Adapter with Glass, Mount Conversion Adapter This is an adapter for M42 to Nikon F mount. I used it to use Takumar lenses on a Nikon full-frame camera. There are scratches and paint chips from use (see photo 5). It can be rotated and tightened without any problems, and you can take pictures. Please refrain from purchasing if you are looking for a beautiful item or are very particular about condition. I am selling it because I am changing mounts. I will answer any questions you have about the condition of the product, but please research the detailed specifications of the product yourself (e.g., "Can I use this camera with this lens?").