Photography Cheat Sheet 1: What is aperture and how does it work?

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 the camera, so more exposure time is needed, and/or larger ISO. The smaller the aperture number, the more shallow the depth of field. A shallow DOF means that the area in focus is small, and your focused subject will be surrounded by a more or less blurry background. How does aperture work? How to change the aperture. The numbers written on your lens to indicate the aperture are called “f-stops“. The act of narrowing down the aperture is often referred to as “stopping down” while opening it up is called “stopping up”. Each “stop” means that the light intensity … Read more

Focal Length and Aperture Explained for the Photography Novice

Focal Length The focal length of a lens determines its angle of view, and also how much the subject will be magnified for a given photographic position. Focal length also determines the perspective of an image. Longer focal lengths require shorter exposure times to minimize burring caused by the shake of hands. The Focal Length means how much can your camera see. Aperture   The aperture range of a lens refers to the amount of light that the diaphragm can let inside the camera to reach the sensor. Apertures are listed in terms of f-numbers (expresses the diameter of the entrance pupil in terms of the effective focal length of the lens; It is the quantitative measure of lens speed), which are marked on the lens. On a camera, the f-number is usually adjusted in f-stops. Each “stop” is marked with its corresponding f-number, and represents a halving of the … Read more

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