ISO sensitivity.

Last Update Date : Apr 25. 2018

The sensitivity is based on film sensitivity standards, known as ISO (International Standards Organisation). On digital cameras, the sensitivity rating is used to represent the sensitivity of the digital image sensor.

ISO ranges from 100 to 256000 (depending on model features). Setting the ISO to 100 makes the digital sensor less sensitive to light. This means that a longer/slower shutter speed or a smaller aperture value (small f stop means wider entrance hole). Increasing the ISO value makes the digital sensor more sensitive to light. 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.

 

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Because a low ISO sensitivity means the camera will be less sensitive to light, you need more light to have an optional 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 low shutter speed. However, in a dark place or at night, a low ISO sensitivity and a fast shutter speed will result in a blurry photo.

 

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