- Term: F Stop
Description: An f/ stop is a number used to indicate the size of a lens's aperture opening. Aperture blades open and close like the human eye's iris to let in more or less light. A large opening, which lets in more light and is used in darker situations, is described with a small f/ number like f/1.8, and a small opening, which lets in less light and is used in brightly lit scenarios, is described with a large f/ number like f/22.
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A Thorough Explanation of the Math Behind F Stops
We all know what f stops are and what they mean, but do you really understand the math behind it all? I thought I had a pretty good understanding of f stops and then I cam across this video below and I realized that while I did understand the basics, there is so much more going on that what you think.
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