Infrared filters are made to block mid infrared wavelengths while allowing visible light to pass through. They are sometimes referred to as heat absorbing filters and are ideal at cutting through haze. These types of filters are commonly used to prevent unnecessary heating in items which have bright incandescent light bulbs. Examples of such devices are slide projectors and overhead projectors. You can also get near infrared filters. These types of filters commonly are used in video cameras to compensate for the high sensitivity of the camera's sensors to near-infrared light. Infrared filters can range in price from about $20 to $450. They come in various sizes, styles and brands.