You don’t simply double or halve the numbers. It’s important to note that doubling the f-stop is a little bit different than the other sides of the triangle, since it’s based on an equation. We’ve already mentioned that your aperture controls the depth of field in your image, but remember that slowing down your shutter speed introduces motion blur into your image and increasing ISO introduces noise. Each point of the triangle will control the amount of light that reaches your sensor, but they affect your image in different ways. Still, stopping up and down affects each part of the triangle. F-stops are specific to your aperture, and will only ever be used to refer to that point of the triangle. When photographers refer to stops, they are talking about doubling or halving the light coming through their lens – you can add or take away stops by changing one of the three elements in the triangle. We’re here to talk aperture, and aperture is all about f-stops! There are also (usually) two curtains behind that mirror which slide out of the way in sequence to let the light hit the sensor, but that’s info for another article. When you press the shutter button on a DSLR camera, a mirror inside your camera body lifts to allow that light in for the amount of time you’ve set. Back to our portal analogy, remember that everything to do with aperture is referring to an opening at the back of your lens, which your light will travel through to make an exposure. The next thing you’ll want to understand is how to control the amount of light that travels through your camera. Understanding how f-stops work will help you to control the size of the hole that light travels through. The f-stop is the measurement of the diameter of the aperture. You may often hear of aperture in conjunction with the word f-stop. Here, the bricks of the building are in focus throughout the photo. In contrast, on the right is that same shot with a smaller aperture (f/22). The fore- and backgrounds become less and less sharp the further you get from that point of focus. In the shot on the left, the aperture is wider (f/3.5), so you can see that there is a selective focus that’s sharpest about three or four bricks up. You control how far this portal opens to let light travel through to that other dimension. It’s kind of like one of those portals in one of your favorite sci-fi movies, the one that leads you into another dimension. Your aperture is a hole in the lens of your camera, allowing light into your camera’s body. In this guide, we’ll talk all about the different ways your aperture settings affect your photography, and how to use it to its full potential. Any change at all to your aperture will impact the amount of focus in your image. The challenge here is that your aperture also controls your depth of field. You can choose to widen your aperture or narrow it depending on the amount of light you need in your scene. Simply put, aperture refers to the opening in your lens that lets light into your image. There are several different ways to control that relationship with your manual settings, and today we’re going to be talking all about one of the “big three” – aperture. The key to understanding photography lies in your ability to harness light. Light and photography are like peas and carrots.
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