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In which ways the infrared filter will be used? 1.Archaeology,Military,Police,Medical science,and detective work. Infrared filter allow normally invisible stains and modified items visible. 2.Plant vegetation & Landscape photography. It looks dramatically different when photographed in Infrared. 3.Photographic special effects. Infrared filters give the still and video photographer expressive and unusual effects. In what suitable light source should I use the infrared filters? 680nm for indoor and weak Shadows use. 720nm for indoor and weak light use. 760nm for cloudy outdoor at nightfall and brightness indoor. 850nm for indoor and weak cloudy outdoor light. 950nm for outdoor and strong light,such as summer time. 1000nm for low latitudes and strong reflective light ,such as on the beach by noon time. Package including: 55mm 650nm infrared filter x 1