Nikon 25515 User Manual - Page 56

Sensitivity, Exposure Mode

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More on Photography Sensitivity (Shooting Modes and Only) Sensitivity (ISO equivalency) is the digital equivalent of film speed. The higher the sensitivity, the less light needed to make an exposure, allowing higher shutter speeds and smaller apertures. Much as film with a high ISO rating tends to produce "grainy" images, high sensitivities may be associated with "noise"-randomly spaced, brightly colored pixels concentrated in dark parts of the image. Noise reduction ( 101) can be used to reduce noise in pictures taken at shutter speeds of ¼ s or slower. In (auto) and scene modes, the camera automatically raises sensitivity when lighting is poor. In shooting modes (Custom 1) and (Custom 2), the following options are available: Option Description Approximately equivalent to ISO 50. Recommended unless lighting is poor 50 or faster shutter speeds are required (e.g., when the subject is moving). Noise may appear in pictures taken at settings above this value. 100 Approximately equivalent to ISO 100. 200 Approximately equivalent to ISO 200. Approximately equivalent to ISO 400. Intended for use with natural light400 ing; not recommended when using flash. Approximately equivalent to ISO 50 under normal conditions; when lightAUTO ing is poor, however, camera automatically compensates by raising sensi- tivity to maximum of ISO 200 equivalent ( 36). To choose a value for sensitivity: AUTO 400 200 100 100 8M 50 1/125 F5.6 15 Press button and rotate command dial until desired setting is displayed. At settings other than AUTO, sensitivity is shown in shooting display during shooting. Exposure Mode If AUTO is selected in shutter-priority auto or manual exposure mode, sensitivity will be fixed at ISO 50 equivalent and will not vary with lighting conditions. 46

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More on Photography
46
Sensitivity (Shooting Modes
and
Only)
Sensitivity
(ISO equivalency) is the digital equivalent of film speed.
The higher
the sensitivity, the less light needed to make an exposure, allowing higher
shutter speeds and smaller apertures.
Much as film with a high ISO rating
tends to produce “grainy” images, high sensitivities may be associated with
“noise”—randomly spaced, brightly colored pixels concentrated in dark parts
of the image.
Noise reduction (
101) can be used to reduce noise in pictures
taken at shutter speeds of ¼ s or slower.
In
(auto) and scene modes, the camera automatically raises sensitivity
when lighting is poor.
In shooting modes
(Custom 1) and
(Custom 2),
the following options are available:
Option
50
Approximately equivalent to ISO 50.
Recommended unless lighting is poor
or faster shutter speeds are required (e.g., when the subject is moving).
Noise may appear in pictures taken at settings above this value.
100
Approximately equivalent to ISO 100.
Description
200
Approximately equivalent to ISO 200.
400
Approximately equivalent to ISO 400.
Intended for use with natural light-
ing; not recommended when using flash.
AUTO
Approximately equivalent to ISO 50
under normal conditions; when light-
ing is poor, however, camera automatically compensates by raising sensi-
tivity to maximum of ISO 200 equivalent (
36).
To choose a value for sensitivity:
Press
button and rotate command dial until desired setting is displayed.
At set-
tings other than
AUTO
, sensitivity is shown in shooting display during shooting.
100
100
100
F5.6
F5.6
F5.6
1/
125
125
1/125
15
15
15
8M
8M
8M
50
50
50
400
400
400
AUTO
AUTO
AUTO
100
100
100
200
200
200
Exposure Mode
If
AUTO
is selected in shutter-priority auto or manual exposure mode, sensitivity will be
fixed at ISO 50 equivalent and will not vary with lighting conditions.