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•In fast-breaking situations, or in candid shooting, you can prefocus the lens by using the distance scale engraved on top of the lens barrel. Estimate the distance between you and the subject. Then turn the focusing ring until this distance (in feet or meters) is aligned with the focusing index mark. This method is especially useful when there is not enough time for through-the-lens focusing, or when you do not want to draw attention to yourself by lifting the camera to eye level.

•Film Plane Indicator – the mark engraved on the camera just to the left of the pentaprism indicates the exact position of the film plane. This is an aid when actually measuring the film-to-subject distance in macrophotography.

•Black and White Infrared Photography: Because infrared light rays focus on a plane slightly behind that of ordinary light rays, it is necessary to modify slightly the normal method of focusing the lens. First, focus on the main subject as usual. Next, take note of the focused distance (in feet or meters) which appears opposite the focusing index mark. Then, turn the focusing ring slightly, so that the focused distance is aligned with the tiny red dot engraved on the lens barrel just to the right of the

focusing index mark. Use a red filter (R1) over the lens and set the aperture ring manually hollowing the film manufacture's suggestion for exposure settings.

•Color Infrared Photography: In color infrared film, two of the film's layers are sensitive only to visible light, while the third layer is sensitive only to infrared. Therefore, it is not necessary to readjust the focused distance. However, f/stops of f/5.6 – 16 are recommended to produce sharp pictures. Use either a dark yellow (Y3) or orange (O1) filter and set the aperture ring manually following the film data sheet.

focused distance

infrared mark

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