Read through your camera manual on how to change aperature. But usually there's a wheel that allows you to change the aperature wider or narrower. Now, how your camera works button-wise is a question for your camera manual. While we can get the maximum or minimum depth of field by working at each end of the aperture range, sometimes we want a more intermediate level of depth of field, limiting focus to a specific range of distances within the overall photograph. One way to do this is to choose a mid-range f/stop, like f/5.6, and shoot a test frame. In image playback, use the magnifying function of the LCD to zoom in and check the depth of field make adjustments if necessary and reshoot. The F/stop number is about the diameter of the lens aperture, how much light it lets in (a smaller f/stop number is a larger diameter aperture allowing more. To change the f-stop go to manual or aperature priority mode (we'll go with aperature priority, so flip the turn dial to 'A'). When choosing lenses for landscape photography, we usually want to see as much detail as possible from foreground to background we want to achieve the maximum depth of field by choosing a small aperture (higher f/stop, like f/8 or f/11). This helps direct the viewer's attention to the subject. Aperture for Portraitsįor classic portraiture we separate our subject from the surroundings by using "selective focus." Choosing a large aperture (lower f/stop, like f2.8) creates very shallow depth of field with only the subject, or just a portion of the subject, in focus. Now that we know how to control depth of field, what determines the choices we make in selecting the aperture? We use focus and depth of field to direct attention to what is important in the photograph, and we use lack of focus to minimize distractions that cannot be eliminated from the composition. While there are no rules, there are some guidelines for selecting Aperture priority.
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