The lens of the camera lens is used to receive various filters and the external camera. However, different types of cameras have different thread diameters, which are called filters. Be sure to check when you buy the lens. The lens aperture of the camera is the same as the lens of the purchased lens. Only two of them can be connected directly. Of course, if you don't agree, you can change the filter aperture by switching the ring. Install the adapter on the lens, and then install the external camera on the switch ring.