Leica M7の取扱説明書・マニュアル [全134ページ 1.37MB]
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gizport - 2013-09-01
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87The depth-of-field scaleThe plane which is rendered sharpest is the plane,parallel to the film, upon which the lens is fo-cused. The optimum sharpness decreases pro-gressively in front of and behind this plane so thata certain range exists within which the image is, tothe eye, rendered sharply. This range is termed the depth-of-field. It is de-pendent on the focus setting, the focal length ofthe lens (the two values together determine thereproduction ratio) and the aperture. Stopping down, i.e. selection of a larger f-number, increasesdepth-of-field, while opening the aperture, i.e. selection of a smaller f-number, decreases it. The depth-of-field scale in conjunction with the focusing ring indicates the range of sharpness atthe set focus distance.For example, using the LEICA SUMMILUX-M50mm f/1.4 lens focused at 5 meters, the depthof field at f/4 ranges from approximately 4 to 8meters. Stopping down to f/11 at the same focus-ing distance, however, increases the range to 3-20 meters.
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