在此再提醒一下,小弟之前貼的官方網上就有聲明了 Electronic Does Not Equal Mechanical
One extremely important thing to keep in mind is that the Okii USB Focus Controller can not have the exact same feel as a mechanical follow focus. Canon's USB implementation provides the camera with the ability to move the focus using the lens motor in three different sized steps. Each command that is sent from the USB Focus Controller to the camera has a parameter that specifies the step size, be it small, medium, or large. What those step sizes equate to are different for every single model of lens. Additionally, zoom lenses vary between focal lengths. For instance, if you are using the 24-70mm f/2.8L, a "small" step size focus command at 24mm will cover more distance than the same command at 70mm.