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With professional models like the 70-200mm f/2.8 produced by all the main brands the aperture remains constant at f/2.8 throughout. More on aperture later in the Settings category.

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It also provides a shallower depth of field and more bokeh, like in portrait shots. A high f-stop, like f/3.2, means a narrow aperture, which lets in less light and keeps more of the image in focus.