[. . . ] This lens can be used as a standard zoom lens for Nikon Digital Cameras. When mounted, the lens' picture angle becomes 79°­ 44° and its 35mm equivalent focal length is approximately 25. [. . . ] 1 Set the lens to its minimum aperture (f/22) by aligning it with the aperture index. 2 Slide the lock lever toward the aperture ring, so the two orange dots are aligned. Various interchangeable focusing screens are available for certain Nikon SLR cameras to suit any picture-taking situation. The ones recommended for use with this lens are: Acceptable focusing The in-focus image in the central spot may prove to be slightly out of focus on film. Since type M screen can be used for both macrophotography at a 1:1 magnification ratio and for photomicrography, it has different applications than other screens. When using the B, E, K2, B2 and E2 focusing screens in cameras other than those listed above, refer to the columns for the B, E and K screens. Taking Flash Pictures with Cameras having Built-in Flash Check the focal length and shooting distance before taking flash pictures to prevent vignetting from occuring. Cameras F60-Series/N60*, F50-Series/N50*, F-601/N6006*, Pronea S F70-Series/N70*, Pronea 600i/6i* F80-Series/N80-Series* F65-Series/N65-Series*, F55-Series/ N55-Series* D100 D70 Usable focal length / Shooting distance Not usable at any focal length setting 35mm / 3m (9. Align the index ( ) on the hood with the lens hood mounting index on the lens, and turn the hood counterclockwise (as viewed from the camera) until it click stops at the index ( ). To facilitate attachment or removal of the hood, hold it by its base rather than its outer edge. To remove dirt and smudges, use a soft, clean cotton cloth or lens tissue moistened with ethanol (alcohol) or lens cleaner. Wipe in a circular motion from center to outer edge, taking care not to leave traces or touch other parts. [. . . ] 52), when the subject is highly patterned or of low contrast, such as a field covered with flowers, autofocus may be difficult to obtain. In such situations: (1) Focus on a different subject located at the same distance from the camera, then use the focus lock, recompose, and shoot. [. . . ]