Noise is heat generated from the sensor and appears as red specks in the image, which looks horrible! The amount of noise generated by the sensor depends on two things: the quality of the sensor and ISO.

ISO is the sensitivity of the sensor inside the camera. When the ISO is increased the sensor generates more heat and becomes more sensitive to light, therefore the noise increases. ISO can typically range from 100 to 1600 and some 3200.

Increasing the ISO is useful in low light conditions or when seeking more depth of field.

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