HOW APERTURE WORKS: When an object is in focus, light rays originating from that point converge at a point on the camera&#x27;s sensor. If the light rays hit the sensor at slightly different locations (arriving at a disc instead of a point), then this object will be rendered as out of focus -- and increasingly so depending on how far apart the light rays are. The lens with the larger aperture therefore has a smaller distance range over which objects reaching the sensor will remain in focus.