The smaller aperture allows you to capture a wide depth of field. That means that everything is in focus. That’s what I like in a landscape image. I preset the f22 setting on my SLR camera in AV mode. AV stands for aperture value which is the size of the diaphragm inside the lens. I can even set this at higher settings but f22 seems to be ideal. My point and shoot camera’s smallest aperture setting is an f 8.