Nikon D70s D70s User's Manual - Page 86

Exposure Mode, CPU Lenses, Depth-of-Field Preview, ISO Auto - user s manual

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Taking Photographs-Exposure Exposure Mode When the mode dial is rotated to P, S, A, or M, the user can set shutter speed and aperture as described on the following pages. CPU Lenses When using a CPU lens equipped with an aperture ring, lock the aperture ring at the minimum aperture (highest f/-number). At other settings, the shutter release will be disabled and a blinking will appear in the aperture displays in the top control panel and viewfinder. Type G lenses are not equipped with an aperture ring. Non-CPU Lenses Non-CPU lenses can only be used in mode M, when aperture can be adjusted manually using the lens aperture ring. In other modes, the shutter-release will be disabled and a blinking will appear in the control panel and viewfinder aperture displays. Depth-of-Field Preview To preview the effects of aperture, press and hold the depth-of-field preview button. If a CPU lens is attached, the lens will be stopped down to the aperture value selected by the camera (P and S modes) or the value chosen by the user (A and M modes), allowing depth of field to be previewed in the viewfinder (depth-of-field preview is not available with non-CPU lenses). 5-ISO Auto ( 142) When On is selected for Custom Setting 5 (ISO auto), the camera automatically varies sensitivity in the range 200-1600 (ISO equivalent) to help ensure optimum exposure and flash level. In P and A modes, the camera adjusts sensitivity when the shutter speed needed to obtain optimum exposure would be faster than /1 8000 s or slower than a specified value (shutter speed may drop below the specified value if optimal exposure can not be achieved at ISO 1600 equivalent). Otherwise the camera adjusts sensitivity when the limits of the camera exposure metering system are exceeded (mode S) or when optimum exposure can not be achieved at the shutter-speed and aperture selected by the user (mode M). When sensitivity is altered from the value selected by the user, ISO AUTO flashes in the control panel and viewfinder. In the camera photo information display for pictures taken at altered sensitivities, the ISO value will be displayed in red. Note that noise is more likely to appear in photographs taken at higher sensitivities. 76

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76
Taking Photographs—Exposure
Exposure Mode
When the mode dial is rotated to
P
,
S
,
A
, or
M
, the user can set shutter speed
and aperture as described on the following pages.
CPU Lenses
When using a CPU lens equipped with an aperture ring, lock the aperture ring at the
minimum aperture (highest f/-number).
At other settings, the shutter release will be
disabled and a blinking
will appear in the aperture displays in the top control
panel and viewfinder.
Type G lenses are not equipped with an aperture ring.
Non-CPU Lenses
Non-CPU lenses can only be used in mode
M
, when aperture can be adjusted manually
using the lens aperture ring.
In other modes, the shutter-release will be disabled and a
blinking
will appear in the control panel and viewfinder aperture displays.
Depth-of-Field Preview
To preview the effects of aperture, press and hold the
depth-of-field preview button.
If a CPU lens is attached,
the lens will be stopped down to the aperture value
selected by the camera (
P
and
S
modes) or the value
chosen by the user
(
A
and
M
modes), allowing depth of
field to be previewed in the viewfinder (depth-of-field
preview is not available with non-CPU lenses).
5—ISO Auto (
142)
When
On
is selected for Custom Setting 5 (
ISO auto
), the camera automatically varies
sensitivity in the range 200–1600 (ISO equivalent) to help ensure optimum exposure
and flash level.
In
P
and
A
modes, the camera adjusts sensitivity when the shutter
speed needed to obtain optimum exposure would be faster than
1
/
8000
s or slower than
a specified value (shutter speed may drop below the specified value if optimal exposure
can not be achieved at ISO 1600 equivalent).
Otherwise the camera adjusts sensitiv-
ity when the limits of the camera exposure metering system are exceeded (mode
S
)
or when optimum exposure can not be achieved at the shutter-speed and aperture
selected by the user (mode
M
).
When sensitivity is altered from the value selected by
the user,
ISO AUTO
flashes in the control panel and
viewfinder.
In the camera photo information display for
pictures taken at altered sensitivities, the ISO value will
be displayed in red.
Note that noise is more likely to ap-
pear in photographs taken at higher sensitivities.