The Hoya R72 Infrared Filter is designed for photography using infrared films. It only allows infrared rays above 720nm to pass through, enabling you to capture stunning images with unique effects. This filter is particularly useful in various fields, including crime detection and medical photography, where infrared imaging is essential. Additionally, it aids in detecting vegetation distribution, making it a valuable tool for environmental studies. With this filter, you can enhance your photography and explore new creative possibilities.