F-Stops Explained

 Aperture is the opening in a lens through which light passes to enter the camera. It's easier to understand if you think about it as your eyes. As you move between bright and dark environments, the iris in your eye either expands or shrinks, controlling the size of your pupil. You can shrink or enlarge the size of the aperture to allow more or less light to reach your camera sensor. The image below shows an aperture in a lens. F-stop or f-number, is the ratio of the lens focal length to the diameter of the entrance pupil. In simple terms it's the number that your camera shows you when you change the size of the lens aperture. Sometimes the f-stop will be shown without a slash in between like f.3.5, or with a capital "F" letter. It's written as a fraction. 

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