Opteka HD2 52mm R72 720nm Infrared X-Ray IR Filter Brand New Opteka HD2 R72 720nm Infrared X-Ray "See Through" Multi-Coated IR Filter This filter can help you to see perfectly through sunglasses and dark, tinted car windows IR filters used in conjunction with an IR sensitive camera can sometimes see things completely invisible to the human eye Other applications where the IR filter can be used include: environmental studies, natural resource studies, monitoring geographical changes What are you waiting for? This filter will give you hours of photographic fun!