The light changes the photosensitive salts to varying degrees depending on the amount of light striking them. Lateral reversal is a mirror image reversal of the subject from left to right, as found in the viewfinders of some reflex cameras. Latitude is the degree by which exposure can be varied and still produce an acceptable image. The degree of latitude varies by film type. Faster films tend to have greater latitude than slower films.
Leader is the beginning of a roll of film, which is attached to the camera's take up spool.
Lens One or more pieces of optical glass or similar material designed to collect and focus rays of light to form a sharp image on the film, paper, or projection screen. Lens Shade A collar or hood at the front of a lens that keeps unwanted light from striking the lens and causing image flare. May be attached or detachable, and should be sized to the particular lens to avoid vignetting. A fast lens transmits more light and has a larger opening than a slow lens. Lightbox is a box of fluorescent tubes balanced for white light and covered with translucent glass or plastic.