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F stop on camera7/27/2023 ![]() When it comes to physically using aperture on your camera, adjusting your aperture should be simple! Every camera has an f-stop number digitally displayed on an LCD screen, or on the dialog box on the top of the camera. Traditionally, a lens that goes below an f/4 is classified as a “fast lens,” which refers to the maximum aperture diameter (or f-stop). For example, some lenses don’t go below an f/4 and others can go down to an f/1.2. Well, that’s because they’re a fraction that stands for the ratio of the focal length of a lens to the diameter of the entrance pupil.īasically, f-stops are a quantitative measure of the lens speed and are often specific to what type of lens you’re using. You might be wondering why f-stops are displayed using decimals (e.g., 1.4, 2.8, and more). So, f/1.4 means the aperture is pretty much all the way open, and lots of light is entering the camera. The lower the f-stop number, the larger the aperture, and the more light enters the camera. The higher the f-stop number, the smaller the aperture, which means less light enters the camera. Simply put, the f-stop number is tied to aperture.
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