The lens is a primary component of your digital camera. The lens is made of optical glass or plastic that has been designed to gather light reflected from the subject and project it onto the light-sensitive computer chips in your camera. The lens serves as your camera's eye, determining what your camera can see and how well what is seen is conveyed to the camera's image sensor. No matter how many megapixels a camera has, if it has a low-quality lens, the picture quality will be inferior.