![]() Turn your camera on, and then turn the Mode dial to align the Av with the indicator line.That small opening reduces the amount of incoming light, and this reduction of light requires that the shutter stay open longer. On the other hand, bright scenes require the use of a small aperture (such as f/16 or f/22), especially if you want to use a slower shutter speed. ![]() This is why lenses with large maximum apertures, such as f/1.4, are called “fast” lenses. If your lens has a larger aperture, you can let in more light all at once, which means that you can use faster shutter speeds. You will recall that, when in Tv mode, there is a limit at which you can handhold your camera without introducing movement or hand shake, which causes blurriness in the final picture. The larger the maximum aperture, the less light you need to achieve a properly exposed image. Different lenses have different maximum apertures. But it’s also pivotal in determining the limits of available light that you can shoot in. We have established that Aperture Priority (Av) mode is highly useful in controlling the depth of field in your image. ![]() The stops are also now typically divided into 1/3-stop increments to allow much finer adjustments to exposures, as well as to match the incremental values of your camera’s ISO settings, which are also adjusted in 1/3-stop increments. Today, most lenses don’t have f-stop markings, since all adjustments to this setting are performed via the camera’s electronics. Each stop represents about half the amount of light entering the lens iris as the larger stop before it. Older camera lenses used one-stop increments to assist in exposure adjustments, such as 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, and 22. These measurements are defined as “stops” and work incrementally with your shutter speed to create proper exposure. The f-stop is one of those old photography terms that, technically, relates to the focal length of the lens (e.g., 200mm) divided by the effective aperture diameter. When shooting portraits or wildlife ( Figure 4.7)Īs discussed earlier, when referring to the numeric value of your lens aperture, you will find it described as an f-stop. Here’s a guide to help you decide when to use Aperture Priority (Av) mode: If you want to keep the entire scene sharply focused, such as with a landscape scene, then using a small aperture will render the greatest amount of depth of field possible. If you want to isolate a subject from the background, such as when shooting a portrait, you can use a large aperture to keep the focus on your subject and make both the foreground and background blurry. It is the controlling factor of how much area in your image is in focus. Depth of field, along with composition, is a major factor in how you direct attention to what is important in your image. Why, you may ask, is this one of my favorite modes? It’s because the aperture of your lens dictates depth of field. Av, more commonly referred to as Aperture Priority mode, is also deemed a semiautomatic mode because it allows you to once again control one factor of exposure while the camera adjusts for the other. The mode is one of my personal favorites, though, and I believe that it will quickly become one of yours as well. Av stands for Aperture Value and, like Time Value, it’s another term that you’ll seldom hear a photographer toss around. You wouldn’t know it from its name, but Av mode is one of the most useful and popular modes in the Creative zone. Learn More Buy Av: Aperture Priority Mode Canon EOS Rebel T5i / 700D: From Snapshots to Great Shots
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