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Hoya 77mm R72 Infrared Filter - Standard R72 passes only infrared rays above 720nm. The infrared filter is a special optical device that helps to visually penetrate an object's surface in order to view whatever lies below. It makes it possible for you to see images that are normally invisible to the human eye. The infrared filter will allow you to see straight through dark sunglasses or dark tinted car windows as if they were transparent. The imaginative user should have little difficulty in recognizing this filter's potential and expanding its unlimited use. Even though it can't totally penetrate all surfaces, in many cases it can provide some degree of "see-through" ability. You will be amazed with the power if you take the time to experiment and experience its capabilities for yourself. The infreared filter can also be used for improving visibility through certain kinds of fog or haze. This property is particularly important for long-distance photography on the ground where the detail of distant objects is often obscured by haze. It is also useful for high altitude photography like when landing an airplane in a foggy airport. Hoya Standard Filters These filters offer both amateur and professional photographers HOYA's famous quality at reasonable prices. They have single coatings applied to both surfaces to suppress reflection and increase light transmission. Hoya’s single layer coating decreases light reflection off the surface from approximately 9% to an average of 4-5%. To suit models: Any 77mm Lens