From the renowned brand Hoya, the 77mm R-72 Infrared Filter is a high-quality, durable, and effective tool specifically engineered for infrared photography with digital cameras and infrared film. This versatile filter operates in the high-red area of the visible spectrum, starting at approximately 750nm and extending beyond 1000nm. This range of light, invisible to the human eye, is expertly captured by the R-72 filter, which may appear almost opaque due to its unique ability to only pass light from the very high red edge of the visible spectrum and infrared light.The Hoya R-72 Infrared Filter is a testament to the transformative power of infrared photography. It allows photographers to capture images that reflect infrared light differently than normal light, leading to creative, sometimes stunning results that offer a fresh perspective on familiar scenes. It's important to note that due to the unique nature of infrared light, filter factor and exposure compensation can vary widely from visible light and are largely dependent on lighting conditions. This easy-to-use filter is an essential tool for photographers looking to explore the intriguing world of infrared photography..