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BASIC OPERATION
O Previewing Depth-of-Field
If you focus on a particular subject and take a picture, some objects in front of and behind the main subject will be "in focus" in the final photograph. The distance between the nearest and farthest objects, which appear sharp, is called "depth-of- field." Three factors influence depth-of-field: the f/stop at which the picture is taken, the focal length of the lens, and the focused distance between the camera and subject. Depth-of-field decreases as the lens is opened-up. At f/1.4, the maximum aperture of the standard 50mm lens, depth-of-field is very shallow permitting quick and easy focusing on the main subject. At the same f/stop and focused distance, lenses with short focal length (wide-angle lenses) have inherently greater depth-of-field than long lenses in the telephoto range. Also, at very close distances between the camera and subject, any lens has shallow depth-of-field. To preview depth-of-field in the viewfinder of the EF, follow this procedure: First operate the winding lever to cock the shutter. After you have focused and composed your picture in the normal way, check the aperture scale in the viewfinder and note the f/stop selected by the camera. Unlock the aperture ring and manually set it at this f/stop. Push the multi-purpose lever in toward