![]() The lower the f-stop, the less depth of field and the blurrier the background. And aperture doesn’t just affect light - it also affects depth of field. Higher f-stops (also known as high apertures) let less light into the camera. The lower f-stops (also known as low apertures) let more light into the camera. Written on the barrel of your lens, or digitally inside your camera and displayed in the viewfinder or LCD screen, you probably see f/stop markings at one-stop increments. The formula used to assign a number to the lens opening is: f/stop = focal length / diameter of effective aperture (entrance pupil) of the lens. What is a f-stop and how is it calculated? The higher the f-number, the smaller the aperture and the less light that passes through the lens the lower the f-number, the larger the aperture and the more light that passes through the lens. The amount of light that the aperture allows into the lens is functionally represented by the f-stop, which is a ratio of the lens focal length and the diameter of the entrance pupil.Īperture controls the brightness of the image that passes through the lens and falls on the image sensor. The aperture is the physical opening of the lens diaphragm. The letter “f” stands for focal length of the lens.
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