Iso Sensitivity - Samsung EK-GN120 User Manual

Concepts in Photography

ISO sensitivity

The exposure of an image is determined by the sensitivity of the camera. This sensitivity
is based on international film standards, known as ISO standards. On digital cameras, this
sensitivity rating is used to represent the sensitivity of the digital mechanism that captures
the image.
ISO sensitivity doubles as the number doubles. For example, an ISO 200 setting is capable
of taking photos at twice the speed of an ISO 100 setting. However, higher ISO settings can
result in noise. 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.
Changes in the quality and brightness according to ISO sensitivity
Because a low ISO sensitivity means the camera will be less sensitive to light, you need more
light to have an optimal exposure. When using a low ISO sensitivity, 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 sensitivity does not require a slow shutter speed.
However, in a dark place or at night, a low ISO sensitivity and a slow shutter speed will result
in a blurry photo.
A photo taken with a tripod and A blurred photo with a low ISO
high ISO sensitivity sensitivity
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