Nikon 25212 D70 User's Guide - Page 152
Custom Setting 5, ISO Auto
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Menu Guide-Custom Settings Custom Setting 5: ISO Auto To choose whether the camera automatically adjusts sensitivity (ISO equivalency) as necessary to 05 ISO auto achieve optimal exposure and flash level, highlight ISO auto in the CSM menu ( 135) and press the Off OK multi selector to the right. Press the multi selector On up or down to highlight an option, then press to ? the right to make a selection. Option Description Off Sensitivity remains fixed at value selected by user ( 46), even if optimal (default) exposure can not be achieved. If optimal exposure and flash level can not be achieved at sensitivity selected by user, sensitivity is adjusted to compensate, to minimum approximately equivalent to ISO 200 and a maximum approximately equivalent to ISO 1600. ISO AUTO icon is displayed in control panel and viewfinder; unless Speedlight is used, icon blinks when sensitivity is altered from value selected by user. Note that noise is more likely at high sensitivities. • When mode dial is set to P, A or : camera auOn tomatically adjusts sensitivity when shutter speed needed to obtain opti- mum exposure would be faster than 1/8000 s or slower than value specified for P, A, DVP mode ( 143; shutter speed may drop below specified value if optimal exposure can not be achieved at ISO 1600 equivalent). • When mode dial is set to S: camera automatically adjusts sensitivity when limits of camera exposure metering system are exceeded. • When mode dial is set to M: camera automatically adjusts sensitivity when optimum exposure can not be achieved at selected shutter-speed and aperture. Using a Flash If a high sensitivity is required for optimal flash output when ISO auto is on, the background may be overexposed if the flash is used at slow shutter speeds (slow sync), in bright daylight (daylight sync), or the when the background is brightly lit. ISO Value The value displayed for sensitivity (ISO equivalency) when the ISO button is pressed is the value selected by the user. The value shown when ISO auto is on may differ from the value actually used by camera. 142