A SIMPLE EXPLANATION of F-STOP NUMBERS

Even if you have a good command of using f-stop numbers and properly exposing photographs, you might not understand the math behind why f-stop numbers are what they are. Here’s a simple (albeit math-filled) explanation by Dylan Bennett of what f-stop is, including a simple trick you can use to memorize the f-stop scale. ...or we can go with A Tedious Explanation of the f/stop SIMPLE WORKS FOR ME!