isoWhat is ISO?
ISO is the sensors sensitivity to light. This determines the noise/graininess of an image. The ISO is measured in numbers, for example 200, 800 etc. A low ISO number like 200 entitles you to little graininess but a dark picture, whereas a high ISO is the opposite; allowing you to have a lighter picture that is more noisy. Ideally, people tend to use lower ISO numbers in extremely bright conditions to maintain the brightness and have no noise. This results in a higher quality and more visually appealing photograph. The ISO noise is determined and depended on the camera. For example, if you use a phone camera to take a picture, the sensor is considerably smaller as opposed to a DSLR's. This means that once it reached ISO 800, grain is visible. Depending on the DSLR you own, it can go to certain ISO settings without getting noisy. You will find that a more expensive camera will not get too visibly noisy at ISO 3200, whereas a cheaper DSLR will show signs of noise at a lower ISO like 1600.
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