Some cameras may not require an lens release trigger when using the lens adapter. Before using the adapter, please enable and turn on this function in the settings. The EF-NEX adapter can adapt EF series lens to be used for Sony NEX E-mount camera, making it possible for you to have more choices of lens purchase. Function: The EF-NEX adapter can adapt EF series lens to be used for Sony NEX E-mount camera, making it possible for you to have more choices of lens purchase. Full frame adapter aperture hole design, perfectly supports for Sony full frame camera A7/A7R. Great conductivity thanks to gold-plated pins for signal transmission. Support slow autofocus function, TTL, auto exposure, and automatic aperture. Comes with anti-shake function. Comes with lens release lever for quick release and installation. 1/4 adapter to mount on the tripod. Specification: Color: Black Compatible Lens: for Canon EF series lens Compatible Cameras: for Sony NEX E Mount Camera (including for Sony NEX and full frame camera A7/A7R series.) Front Mount: for Canon EF lens Rear Mount: for Sony NEX E-mount camera Tripod Adapter: 1/4 adapter Item Size: 8 * 6.5 * 3cm / 3.1 * 2.6 * 1.2in Item Weight: 190g / 6.7oz Package Size: 10.8 * 9.3 * 5cm / 4.3 * 3.7 * 2.0in Package Weight: 236g / 8.3oz Package List: 1 * Lens Mount Adapter 1 * User Manual