It is T-2 (42mm x 0.75) mount lens to Nikon 1 mount (J1 / V1) adapter. Suitable for T mount devices such as telephoto lens.
Can be used in Nikon 1 mount camera only, not suitable for F mount camera.
It is allow focus infinity focus.
Manual control only, auto focus not allowed.
Although the lens will fit physically, automatic diaphragm, auto-focusing or any other function will not operate correctly while using this adapter.
In this case “Stop-down mode ?will need to be used when metering since the lens doesn’t have the ability to have its aperture controlled by camera body.
You can shoot with manual mode or aperture priority mode.
Nikon 1 mount camera, such as J1, V1
T2 to Nikon 1 adapter x 1