The DLAHD550is a full HD DILA front projector with 30,000 to 1 native contrast ratio Three DILA devices 2x motorized zoom lens HQV ReonVX video processor,onscreen gamma control, flexible setup and more. The DLAHD550 brings Full HD to your home with the 30,000 to 1 native contrast ratio. The native means that it does not rely on an iris mechanism to maximize contrast depending on the average brightness of one scene. This technical sleight of hand employed on other projectors, effectively changes overall luminosity, so that blacks are slightly bleached in bright scenes, while light colors appear duller in dark scenes.