What is the Optical Zoom of the Sony NEX-3NL?
The optical zoom of a camera is a measure of how much the camera can zoom in to the subject using the camera's lens system. An optical zoom is superior to a digital zoom because the zoom is achieved using the optics of lens which means that the full extent of the digital sensor is always used to capture the image.
A larger optical zoom allows you to zoom in on the subject without having to move closer. Compared to a digital zoom, using an optical zoom does not result in a loss of image quality.