73Infrared film (film with extended sensitivity to infrared light) can be used toachieve interesting effects not possible with general-purpose film. Whenusing black-and-white infrared film, the film’s sensitivity to longer wave-lengths requires a slight adjustment in focus using the red infrared indexon the lens. Use a deep red filter to maximize the infrared effect.• When shooting with infrared film, use a lens equipped with a distance scale window.• For black-and-white and color infrared photography, read the instructions provid-ed with the film for proper use.6. Infrared PhotographyAFM22 2250mmAFMAFMAFMmft3 5 108 1 1.5 322 225 101.5 322 225 101.5 322 22mft3 5 108 1 1.5 322 225 101.5 322 225 101.5 322 225 101.5 32 221 Focus the subject.2 Set the lens’ focus mode switch to“M”.3 Read the focus distance from thedistance scale window.• In this example, the distance from thecamera to the subject is 3 m / 10 ft.4 Manually align the lens’ infraredindex with the 3 m / 10 ft index onthe distance scale.• The lens’ infrared index is set for awavelength of 800 nanometers.However, the wavelength characteristicsof general black-and-white infrared filmvaries depending on the type (750~830nanometers). Therefore, to ensure prop-er focus when shooting with infraredfilm, we recommend to take extra shotswith the lens adjusted slightly to thefront and rear of the infrared index.• The characteristics of the lenses listedbelow are such that they do not requirefocus adjustment when using black-and-white infrared film. These lenses are there-fore not equipped with an infrared index.EF200mm f/1.8L USMEF300mm f/2.8L USMEF500mm f/4.5L USMEF600mm f/4L USM00. Part.4 RS (E) (P.65~75) 27-01-2003 11:59 Page 73