What is ISO speed?
Your camera’s ISO setting determines how sensitive the camera’s sensor is to the light that reaches it. A higher ISO setting makes your sensor more sensitive to light, meaning that you can take photos in darker conditions without the need to use a flash or tripod. However, a high ISO also creates more noise, reducing the image quality.
This setting has been adopted from film cameras. It refers to the film’s sensitivity to light. Higher ISO speeds are needed to take pictures in worse lighting conditions, however they also cause an increased amount of noise. 100 ISO is the default. At 400 ISO the noise is easily detectable on most cameras.
