Attention::) This adapter is NOT fully compatible with full-frame Sony A7, A7R and A7S. When the Speed Booster are used with Sony A7, A7R or A7S the camera is required to be used in the "APS-C" Size Capture" mode.:) The lens need to be manually focused and adjusted after connection. But the camera will automatically calculate how much light need to be exposed after the right shooting mode is set.:) While you meet the trouble that the Shutter button can't be pressed (or camera reminds that no lens installed), please modify the [ Defined setting ] to be 【Release the shutter without lens】 or 【Aperture priority】.