ISO is the unit used to measure and adjust the camera sensor’s sensitivity to light. With film, the ISO setting (or film ‘speed’) is part of the film’s physical and chemical properties and can’t be changed. With digital cameras it’s possible to ‘turn up the volume’ on the sensor to make it more sensitivity to […]
This is where the photographer deliberately allows a degree of subject movement during the exposure and it's done by choosing the shutter speed carefully. Examples include panning shots where the subject is sharp but the background is blurred, or the movement in a dancer's hands while their body remains still.