我也有找過wiki的解釋..... 它不也是說 : Typically, a fast shutter speed will require a larger aperture to ensure sufficient light exposure, and a slow shutter speed will require a smaller aperture to avoid excessive exposure. 所以我才覺得怪怪..... f/2.8(大光圈)的最快快門比f/8.0(小光圈)的最快快門竟然還慢吶......