It is the Hoya R72 Infrared Filter that stands out as a specialized tool for infrared photography, compatible with both digital cameras and infrared film. This 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 precisely what the R72 filter is designed to capture.When you look through the R72 filter, it appears almost opaque. This is because it is engineered to only allow light from the extreme high-red edge of the visible spectrum and infrared light to pass through. This unique feature makes it an essential tool for photographers aiming to explore the creative potential of infrared photography.Infrared photography can yield intriguing, sometimes breathtaking results, as objects in a scene reflect infrared light differently than they do normal light. This can lead to images that are truly unique and visually striking, setting your work apart from the rest. However, it's important to note that due to the unique nature of infrared light, both the filter factor and exposure compensation can vary significantly from visible light. These factors are largely dependent on the lighting conditions at the time of shooting. Therefore, mastering the use of the Hoya R72 Infrared Filter may require some experimentation and adjustment, but the potential for stunning, creative results makes it a worthwhile addition to any photographer's toolkit..