![]() So if you are changing from f/2 to f/2.8, you are halving the exposure. So what’s the most important thing to know about these f-stop numbers? From each number to the next, the aperture decreases to half its size. A 50mm lens with an aperture of f/8 is 50 ÷ 8.A 50mm lens with an aperture of f/2 is 50 ÷ 2.Here are a couple more f-stop settings examples: How Do You Calculate an F-stop’s Aperture Size?Īt this point, things get a little bit complicated and somewhat mathematical… To calculate the size of your aperture at a certain f-stop, you must divide the focal length by the fraction.įor example, if you are shooting with a 200mm lens at f/4, the diameter of the aperture is 200 ÷ 4 = 50mm. A large f-number (right) means a small aperture. ![]() This is what the aperture scale looks like from wide (left) to narrow (right): A small f-number (left) is a large aperture. Why does a low number represent the max aperture? The answer is simple. And you can adjust these settings in aperture priority and manual modes in your camera. So the lower the number, the wider the aperture. You’ll see “f/” or “f” on your camera, followed by a number. But why is it so important? It’s because the f-stop scale is what helps you to measure and understand the aperture size. The same goes for your camera’s aperture. We’ll keep it short… The aperture blades, also known as a diaphragm in your lens, work just like the pupil of a human eye. The number following it is a fraction of the focal length.īut before we would jump in further, it’s essential to understand how the aperture works. So what does the “f” stand for in f-stop? The “f” stands for focal length.
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