Nikon D70S User Manual download pdf (Page 152)

142

Menu Guide—Custom Settings

Custom Setting 5: ISO Auto

To choose whether the camera automatically ad-

justs sensitivity (ISO equivalency) as necessary to

achieve optimal exposure and ﬂ ash level, highlight

ISO auto in the CSM menu ( 135) and press the

multi selector to the right. Press the multi selector

up or down to highlight an option, then press to

the right to make a selection.

Option Description

Off

(default)

Sensitivity remains ﬁ xed at value selected by user ( 46), even if optimal

exposure can not be achieved.

If optimal exposure and ﬂ ash level can not be

achieved at sensitivity selected by user, sensitivity

is adjusted to compensate, to minimum approxi-

mately equivalent to ISO 200 and a maximum

approximately equivalent to ISO 1600. ISO AUTO

icon is displayed in control panel and viewﬁ nder;

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 au-

tomatically adjusts sensitivity when shutter speed needed to obtain opti-

mum exposure would be faster than

8000 s or slower than value speciﬁ ed

for P, A, DVP mode ( 143; shutter speed may drop below speciﬁ ed

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 me ter ing sys tem 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

When ISO auto is on, foreground subjects may be underexposed in ﬂ ash photographs

taken at slow shutter speeds, in daylight, or against a bright background. Choose a

ﬂ ash mode other than slow sync or select mode A or M and choose a larger aperture.

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.

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Nikon D70S User Manual Page 152