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More on Photography
Sensitivity
(ISO equivalency) is the digital equivalent of fi lm speed. The higher
the sensitivity, the less light needed to make an exposure, allowing higher
shutter speeds and smaller apertures. Much as fi lm 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 (
109) can be used to reduce noise in pictures
taken at shutter speeds of slower than ¼ s.
In
(auto) and scene modes, the camera automatically raises sensitivity
when lighting is poor. In
P
,
S
,
A
, and
M
modes, the following options are
available:
Option
Description
50
Approximately equivalent to ISO 50. Recommended unless lighting is poor or
faster shutter speeds are required (e.g., when 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.
400
Approximately equivalent to ISO 400.
Auto
Approximately equivalent to ISO 50
under normal conditions; when lighting
is poor, however, camera automatically compensates by raising sensitivity to
maximum of ISO 200 equivalent).
ISO
icon appears in control panel and shoot-
ing display when sensitivity is raised.
Sensitivity
P
,
S
,
A
, and
M
Modes Only
To choose a value for sensitivity:
SENSITIVITY
50
200
400
100
Auto
2
Display options.
1
SENSITIVITY menu displayed.
*
* In place of steps 2–4, selection can be made by rotating command dial (
). Setting
is displayed in control panel while command dial is rotated.
SENSITIVITY
ISO感度設定
Sensitivity
