For example, if the aperture was adjusted from f/4 to f/2.8 you might say that you chose a ‘faster’ aperture, or if your lens is at a maximum aperture of f/2.8 and you're not getting the correct exposure you might say, ‘I need to get a faster lens'. Sometimes, larger apertures are referred to as ‘faster’. The most basic thing we need to know about aperture is that it controls the amount of light that is let into the camera. An image at f/2 and f/4 / David Bode ‘Fast’ Lenses Generally, more expensive lenses have a larger maximum aperture. The largest f-stop a lens can be set to is called its maximum aperture, and this will vary from lens to lens. If we change this again to f/2, we are again doubling the amount of light. All else reminaing equal, if we change the aperture to f/2.8 we’ll effectively double the light we’re allowing to reach the image sensor. This means that each time you increase the opening by one f-stop and you double the light, and that each decrease in the size of the opening by one f-stop halves the light.įor example, if a lens is set to f/4 we’ll get a certain amount of light that enters the camera. Apertures demonstrated / David BodeĮach f-stop corresponds to a light intensity change factor of two. The larger opening lets in more light, and the smaller opening lets in less light. f-stops marked on a lens / David BodeĪ lower f-number is a larger opening and a higher f-number is a smaller opening. A lens typically has a set of marked "f-stops" at regular intervals that the f-number can be set to. In photographic lenses, it's the opening through which light travels, and is usually specified as a measured f-number. How Aperture Works in Photography Lenses What is Aperture?Īn aperture is a hole or opening. What Every Photographer Should Know About Lenses
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