The T2 adapter connects T2 lenses that have a standardized T2 thread to your camera and its bayonet mount. It is screwed onto the lens, after which the lens can be locked in place.

Important: The T2 adapter is purely a mechanical connection or transition ring; it does not utilize or use any existing control contacts, AF drives, or aperture control contacts of your camera.

Lenses with a T2 connection can usually be used on your camera with automatic exposure, but definitely with manual settings for shutter speed and aperture.