Optical zoom involves a physical camera lens movement, which changes the apparent closeness of the image subject by increasing the focal length. It is also referred to as a "true zoom," as it changes a lens' focal length and magnification by physically extending and retracting the lens. This zooming action usually takes place inside the camera, but can often be heard making a sound similar to a small motor.
Video conferencing system is a perfect conference solution that combines audio and video
