1,Compatibility: This T2 adapter ring is compatible for R full frame mirrorless cameras, suitable for use with T2 mount lenses on astronomical telescopes or reflex mirrors, etc. Comes with a mini wrench to assist in tightening or loosening screws. 2,Fully Manual Control: Manual focus and manual aperture adjustment. There are no electrical connections on the ring, so the lens aperture control needs to be set manually. 3,Versatile Adaptability: The T2 adapter ring allows you to connect your R full frame mirrorless camera to lenses, telescopes, microscopes, magnifiers, and bellows equipment with a T2 universal thread mount. 4,Aluminum Alloy: Made of durable aluminum alloy for long lasting use. The internal black matte treatment reduces reflection and glare, ensuring clear images and high contrast. 5,Important Note: When using the adapter ring for the first time, please enable the Release shutter without lens option in the camera body menu, otherwise the adapter lens will not be recognized. Item Type: Lens Mount Adapter Material: Aluminum Alloy Weight: Approx. 143g / 5oz 1 x Lens Mount Adapter 1 x Wrench Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store