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. There is less light coming through the lens, so the shutter must be open longer to allow proper exposure. Slower shutter speeds mean a greater chance that your subject or the camera may move during the exposure. U.S. Use gestures. Motion across the photo is harder to stop than motion toward the camera.