I bought the adapter for Sony HDR-CX550 camcorder my. The locking ring is not ready round but star-shaped / square. Unfortunately, the standard attachment shoe is not entirely correct mounted on the adapter, so that the patch directional microphone is not exactly in the same direction as the camera, but slightly to the right. The whole part seems to be a replica of China and consists of plastic. Only the top screwed rail (not painted in black, but kept in silver) is made of metal. Overall considered are presumably the production costs. in any way the sale price.
