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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96Exposure meteringOn the LEICA M7 exposure metering uses theavailable ambient light selectively through thelens at the working aperture. The reading useslight reflected from a bright metering field onto aphoto diode (arrow). This diode is located behinda collecting lens to the left of and above the shut-ter. The metering field (diameter:12mm, i.e. ap-prox.13% of the negative’s size) is situated in thecenter of the first shutter curtain. The unevennessof the white is not a result of poor manufacturingtolerances, but is due to the fact that a thick, com-plete coating cannot be applied to the rubberisedcloth shutter curtain without the shutter perform-ance being impaired.The irregular structure of the metering field in noways affects the meter reading.The viewfinder displays show or help to determinethe appropriate speed/aperture combination forcorrect exposure: When using the aperture priori-ty mode, the aperture is selected manually, whilethe camera automatically calculates the ap-propriate shutter speed. In this mode, a digitalLED display provides information on the resultingshutter speed (e.g. 1 0).For manual setting of both values, a light balanceconsisting of three red LEDs ( ) is used tobalance the exposure. When the setting is correct,only the central, circular LED is lit.Switching on the exposure meterThe exposure meter is turned on by lightly press-ing the shutter release button (9) to its first pres-sure point, assuming that the camera is turned onwith the main switch (8), the shutter is fullycocked and the shutter speed dial (12) is not setto " B ”.Constant illumination of one of the displays in theviewfinder indicates that the exposure meter isready for use:- the digital shutter speed LED display for aper-ture priority mode- one of the two triangular LEDs, possibly com-bined with the central circular LED, for manualsetting.
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