What is servo af

It has the ability to track and analyse movement, and focus the image based on where it predicts the subject will be at a given point in time. AI Servo AF is the preferred focusing method for Sports photographers, and any kind of photography where the subject is constantly moving.

AI Servo AF is all about capturing movement; the main problem here is that no two moving objects are the same. For example, imagine a sprinter running in a straight line directly towards you. Contrast that with a race car appearing from your left, driving past and then disappearing round the corner to your right. And then, think about a soccer player who is constantly changing direction, accelerating, and disappearing behind other players.

Consumer Business. Support Search Download. Contact Us. This camera has three types of AF modes that can be selected to accommodate different shooting conditions and subjects. In the Basic Zone modes, the optimum AF mode is set automatically. Suited for still subjects. When you press the shutter button halfway, the camera will focus only once. When focus is achieved, the dot inside the AF point achieving focus lights briefly in red, and the focus confirmation light [ ] in the viewfinder will also light.

With evaluative metering, the exposure setting will be set at the same time focus is achieved. While you hold down the shutter button halfway, the focus will be locked. As you can imagine, this is hugely helpful if you want to focus then recompose. You can focus on one subject, then maintain focus while adjusting your composition to include other elements. Lock focus on a biker riding toward you, and the focus will remain locked on the original spot, even as the biker zooms forward.

I half-pressed the shutter to focus on his body, then adjusted my composition while keeping the focus locked. AI-Servo AF tracks moving subjects. You half-press the shutter button to tell your lens to start focusing — then, if the area under your point of focus changes, your lens refocuses continuously until you take the photo.

One of the advantages of back button focusing is that it enables you to use both AI Servo to track focus and One Shot for still subjects:.

This is particularly relevant when photographing:. Let me explain what AI Focus is first. On the other hand, AI Servo is ideally suited to tracking moving subjects and focusing at very shallow depths of field. AI Servo is your best option for focusing even with just small subject movements like these slightly different poses. Very often new photographers get autofocus modes confused with autofocus area modes. These are two separate focusing functions and you need to set both options:. Most of these area modes can be used in both One Shot aka single servo or AI Servo aka continuous autofocus.