Samsung NX1 User Manual

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Samsung NX1 User Manual Manual pdf 21 page image

20Concepts in PhotographyISO sensitivityThe exposure of an image is determined by the sensitivity of the camera.This sensitivity is based on international film standards, known as ISOstandards. On digital cameras, this sensitivity rating is used to representthe sensitivity of the digital mechanism that captures the image.ISO sensitivity doubles as the number doubles. For example, anISO 200 setting is capable of capturing images at twice the speed of anISO 100 setting. However, higher ISO settings can result in “noise“—smallspecks, spots, and other phenomena in a photo that give the shot a noisyor dirty appearance. As a general rule, it is best to use a low ISO settingto prevent noise in your photos, unless you are shooting in darkenedenvironments or at night.Changes in the quality and brightness according to ISO sensitivityBecause a low ISO sensitivity means the camera will be less sensitive tolight, you need more light to have an optimal exposure. When using a lowISO sensitivity, open the aperture more or reduce the shutter speed toallow more light to enter the camera. For example, on a sunny day whenlight is abundant, a low ISO sensitivity does not require a slow shutterspeed. However, in a dark place or at night, a low ISO sensitivity willresult in a blurry photo. Therefore, it is recommended to increase the ISOsensitivity by a moderate amount.A photo captured with a tripod and highISO sensitivityA blurred photo with a low ISO sensitivity