Your decisions about shutter speed and lens setting will affect how much and which parts of your picture are sharp. Shutter speed determines the amount of blur that will be caused by motion. There is a trade-off between the two. The faster your shutter speed, to better stop motion, the wider you must open your lens, thus reducing depth of field. The reverse is also true.
Most cameras have a table on the lens that indicates depth of field for different lens settings.
You can also use this table to pre-set focus for a desired range of distances. Since it's the denominator of a fraction, a larger number means a smaller opening. Shutter speed U.S. Slow shutter speed lets moving objects blur. Shutter speed is the amount of time the shutter is open, allowing light to fall on the film. In order to use smaller lens openings for more depth of field, you must use a slower shutter speed.