This part isn’t as intuitive as it should be. “I want a stop more light,” or “I want two less stops.” They are just talking about the number of times they are halving/doubling the amount of light. NOTE: Sometimes when you hear the word “stop(s)” being used, they may just be talking about increasing/decreasing the amount of light but these ratios (in general). F/7.1 lets 1/3 more light than the full stop of f/8. So f/6.3 is a 1/3 less light than the full stop of f/5.6. Since the numbers above represent doubling/halving the amount of like, these numbers represent a 1/3 differences. ![]() These numbers fall in between the full stops listed above. When setting your aperture you may see other numbers like f/3.5, f/6.3, or f/7.1. When you change from one stop to the next, you are either halving or doubling the size of the aperture (in square mm) which also means you’re either halving or doubling the amount of light passing through to the sensor/film. So maybe you would shoot at f/2.8 or f/16. Lets start with a sequence of numbers you may be more familiar with. Wow, that sounds confusing! Technically it can be confusing, but don’t worry you don’t need to know the technical end to take good pictures. They are ratios that half/double the hole of the aperture. ![]() This gives you the diameter of the aperture (which you don’t really need to know to understand f/stops) What are Stops? The f/stop is the focal length (f) of the lens divided (/) by the Stop of the aperture. This isn’t a post about apertures, although your f/stop relates to your aperture. Here’s a quick (or not so quick) post about f/stops.
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