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Brian Liepe: Okay, so one of the most effective ways to adjust your exposure in your camera is by adjusting the aperture. The aperture is a mechanism inside the lens that's made up of a series of blades that either let light in or keep it out. Now you usually interface with this aperture through your camera. Chad Perkins: The openness of the aperture is measured using a degree of measurement called an f-stop. Now because aperture is a function of the lens exact settings will vary from lens to lens.
Now another feature of aperture is it controls focus, so in other words your depth of field, and we will talk about that a little bit later. Brian Liepe: The unit of measurement that represents the size of your aperture is called an f-stop. That can be a little bit tricky because the lower the f- stop number, the bigger the aperture, and vice versa. The higher the f-stop number, the smaller the aperture. Now we've covered the basics of aperture, but if you're curious, we are going to explain a little bit more about the technical details regarding f-stops. Chard Perkins: The reason why f-stops increase as the size of the aperture decreases is that because F stands for fraction.
So if you have an f-stop of f/4, this really means that the aperture is open to one fourth of the size of the focal length of the lens. Brian Liepe: So if we had a 100 mm lens and our f-stop was a value of f/4, the aperture diameter would be 25 mm. If we increase the f-stop to f/8 on the same lens, we are now closing the aperture to 1/8th of its focal length. So the diameter of the aperture is now 12.5 mm. Chad Perkins: In the next tutorial, we will look a little bit more closely at how aperture relates to focus.
We will also look at some of the pros and cons of adjusting your exposure by using your aperture.
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