Leica MPの取扱説明書・マニュアル [全114ページ 0.89MB]
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gizport - 2013-09-17
http://jp.leica-camera.com/.../download.php?filename=file_3664.pdf - 0.89MB
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90General notes on exposure meteringMost subjects normally have even distribution of dark and light subject details. This kind of normal subjects reflect 18% of the incident light,corresponding to a grey scale value to which allexposure meters are calibrated.If the subject actually reflects more light, e.g. asnowy winter landscape, a bright sandy beach,white house walls or a white wedding dress, ashutter speed and aperture setting in accor-dance with the exposure meter display would result in underexposure.By contrast, subjects with predominantly darkdetails, e.g. a black steam engine, dark grey slateroofs or a dark blue captain’s uniform, reflectless light and a shutter speed and aperture setting in accordance with the exposure meterdisplay would result in overexposure.In this kind of cases, the exposure meter valuehas to be corrected, if you are aiming for opti-mum exposure results. This is not the case if youuse selective metering and take the measure-ment from part of the subject with a good distri-bution of light and dark details.For example, in a wedding photo you can takethe measurement from the bride’s face and notthe white wedding dress. For landscape photo-graphs using a wide angle lens, the camera canbe tilted until the LEICA MP’s selective meteringfield does not record the bright sections of thesky.If there is no suitable section of the subject tomeasure in this way, it is necessary to use acompensation factor, i.e. the shutter speed is extended by 2 to 4 times or the aperture is opened by 1 to 2 stops.For sunlit snowy ground, for example, the com-pensation factor is 4, i.e. instead of the meteredshutter speed of 1/1000s at f/8, the exposureuses either 1/250s at f/8 or 1/1000s at f/4.For less bright subjects, e.g. a bright beach, ancompensation factor of 1.5 is sufficient. The reverse procedure is used for dark subjects.
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