F-stops vs. t-stops: Understanding what this means

- If you've got enough of an interest in photography…that you're watching this video,…then you are probably already…familiar with the term F stop.…And you probably know that when you set the aperture…on your camera's lens, you do so using an F stop scale.…You probably know that changing the F stop…changes the size of the aperture inside the lens…which allows more or less light to pass through the lens.…Changing the aperture makes for a brighter or darker…image and because of the physics of light,…changing the aperture alters the amount…of depth of field in your image.…You may not, though, have ever learned exactly what…the F number itself means.…

It's derived from a simple ratio, the ratio of…the focal length of the lens to…the size of the lens' aperture.…That second number, the aperture, is a circle of course,…and that's why F stop numbers are so strange.…Since the calculation of the F stop involves the area…of a circle, we end up with fractional numbers.…5.6, 3.5, those end up in our F stop scale.…With F stop numbers it's important to know that the F…