Made of high-quality metal material, the M42-AI M42 Thread Lens to AI Mount Metal Adapter Stepping Ring offers a durable solution for your photography needs. Its features include:

• Allows the lens to become a Marco lens on the camera body
• No ROM connection on the ring, enabling manual diaphragm control of the lens
• M42 to all for NIKON AF mount adapter ring compatibility
• Suitable for NIKON D5100, D3100, D3300, D90, D80, D700, D300, D3 mount adapter

It's important to note:

• Automatic diaphragm, auto-focusing, or other functions will not operate correctly with this adapter
• "Stop-down mode" will need to be used when metering
• Manual mode or aperture priority mode can be used for shooting