Pentax MX MX Manual - Page 22
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DEPTH-OF-FIELD PREVIEW LEVER AND SCALE Depth of field is the range between the nearest and farthest distances which are in focus at a given lens aperture. If you want to know how great the depth of field is at a certain aperture, focus on a subject and look through the viewfinder while moving the Self-timer lever toward the lens, and you will be able to preview the depth of field. Or, after focusing, look at the depth-of-field scale on the lens. In the photograph below, the distance scale is set at 5 meters; that is, the a lens is focused on a subject 5 meters away. The calibrations on each side of the distance index correspond to the diaphragm setting and indicate the range of in-focus distance for different lens apertures. For example, if a lens opening of f/4 is to be used, the range on the distance scale ring covered within the figure 4 on the depth-of-field scale indicates the area in focus at that lens opening. You will note from the depth-of-field scale in the photograph that the range from approximately 4 to 7m is in focus. Note that as the lens aperture changes, the effective depth of field also changes. For the depths of field at different apertures and distances, refer to the next page. ft co 2t2 12 8 6 m 22 16 212245422 i3s"te 3 2.2 22 16 11 8 4 2.8- 2 1.4 4 / • 7 6 5 4 3 2 1 0 Distance (ml 20*