Nikon 25214 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

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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 flash 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.
?
05
ISO auto
Off
OK
On
Option
Description
Off
(default)
Sensitivity remains fixed at value selected by user (
46), even if optimal
exposure can not be achieved.
On
If optimal exposure and flash 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 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 au-
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 back-
ground 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.