When using third-party lenses and mount adapters, communication between camera and lens is rarely supported, leading to some camera functions not being available. Some examples include auto focus and image stabilization, and do not represent a malfunction of the camera. It is usually necessary to select the Release without lens option in the camera menu to allow the camera to release the shutter and take a picture.
NOTE: If model-specific information is required to select the Release without lens option, refer to the operating instructions supplied with the product. Manuals are posted on your model support page.