What is aperture? Definition: The aperture of a lens is the diameter of the diaphragm opening. It determines the amount of light that enters the camera and reaches the sensor. Explanation: The camera aperture is a key factor in the exposure triangle (aperture-focal length-ISO), and also determines the depth of field. The larger the aperture number, the less light will enter… Continue reading Photography Cheat Sheet 1: What is aperture and how does it work?