Canon New F-1 Instruction Manual

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12 APERTUREThe smaller the aperture, the wider the range of sharpness. This is illustrated bythe picture above which was taken at f/22. Compare it with the photo to s right.This extended depth of field is especially good for such subjects as landscapes.The larger the aperture, the narrower the range of sharpness. An aperture of f/1.4,for instance, can isolate your subject from its surroundings. This is often used toblur a disturbing background in portraiture.Depth of field is also greater the shorter the focal length of the lens. A 24mm lens,for example, will show greater depth of field than a 50mm lens, provided the aper-ture and shooting distance are the same. Depth of field is also greater the longer theshooting distance, and is generally greater in the background than in the foregroundby a ratio of two to one.24All manuals and user guides at all-guides.com