Samsung BN59-01012A Fiche De Données
19
Concepts in Photography
ISO sensitivity
The exposure of an image is determined by the sensitivity of the camera to
light. This sensitivity is measured by a set of international film standards,
known as ISO standards. On digital cameras, this sensitivity rating is used
to indicate the light sensitivity of the digital sensor that captures the
image.
light. This sensitivity is measured by a set of international film standards,
known as ISO standards. On digital cameras, this sensitivity rating is used
to indicate the light sensitivity of the digital sensor that captures the
image.
ISO sensitivity doubles as the ISO number doubles. For example, an ISO
200 setting is capable of capturing images at twice the speed of an ISO
100 setting. However, higher ISO settings can result in “noise“—small
specks, spots, and other phenomena in a photo that give the shot a noisy
or dirty appearance. As a general rule, it is best to use a low ISO setting
to prevent noise in your photos, unless you are shooting in darkened
environments or at night.
200 setting is capable of capturing images at twice the speed of an ISO
100 setting. However, higher ISO settings can result in “noise“—small
specks, spots, and other phenomena in a photo that give the shot a noisy
or dirty appearance. As a general rule, it is best to use a low ISO setting
to prevent noise in your photos, unless you are shooting in darkened
environments or at night.
A photo captured with a low ISO setting.
The photo is clear.
The same shot captured with a high ISO
setting. The photo is grainy.
Because a low ISO setting means the camera will be less sensitive to light,
you need more light to have an optimal exposure. When using a low ISO
setting, open the aperture more or reduce the shutter speed to allow
more light to enter the camera. For example, on a sunny day when light
is abundant, a low ISO setting does not require a slow shutter speed.
However, in a dark place or at night, a low ISO setting will result in a blurry
photo. To compensate for the lower light level, you should increase the ISO
setting by a moderate amount.
you need more light to have an optimal exposure. When using a low ISO
setting, open the aperture more or reduce the shutter speed to allow
more light to enter the camera. For example, on a sunny day when light
is abundant, a low ISO setting does not require a slow shutter speed.
However, in a dark place or at night, a low ISO setting will result in a blurry
photo. To compensate for the lower light level, you should increase the ISO
setting by a moderate amount.
A photo captured with a tripod and a high
ISO setting.
A blurred photo captured by a camera.