What exactly is aperture priority and how do you make it work for you? In this free video, world renowned outdoor photographer Ian Plant shows you how he employs aperture priority for his landscape images so that every element falls into focus from near to far. To achieve that sharp focus, you need to use smaller apertures such as f11 or f16. In aperture priority, you choose the f-stop, and your camera determines the shutter speed to come up with the correct exposure. If your shutter speed is critical, for instance in photographs of wind-blown trees or waves on the water, then you adjust your ISO up or down. Given the fickle light of landscape photos, aperture priority is a great way to go.