![]() ![]() This is ideal when you are photographing a moving subject and trying to track its position. Essentially, it means that your camera continuously adjusts focus whenever you hold down the focusing button. Continuous-servo is also known as AI Servo (Canon) and AF-C (Nikon).The two most important and common options are continuous-servo and single-servo autofocus: NIKON D7000 + 105mm f/2.8 105mm, ISO 800, 1/400, f/6.3 Continuous vs Single-Servo AutofocusĪnother important decision you must make when using autofocus is to pick your focusing mode. It’s just that phase detection tends to do it more quickly and with better tracking, while contrast detection may do it with more accuracy for nonmoving subjects. Both phase detection and contrast detection can get you there. Keep in mind that there is always an “ideal plane of focus” in a photo – usually, intersecting with your main subject. ![]() (Most mirrorless cameras only have one system, usually a hybrid, so you can’t switch between them see DSLR vs mirrorless.) So, just use viewfinder or live view accordingly. Contrast detection occurs any time you autofocus via the rear LCD screen. On most DSLR cameras, phase detection occurs any time you autofocus via the viewfinder. That’s all good to know, but how do you actually set one or the other for a given photo? This is good when your subject isn’t moving as fast, like landscape photography. However, contrast detection does tend to be more precise, since the autofocus system is directly measuring the data from your camera sensor. As a result, it isn’t good at tracking moving subjects. Contrast detection requires your camera to process more data, which means it generally takes longer to lock focus.(See our detailed explanation of how phase detection autofocus works.) Some cameras let you calibrate your phase detection system to minimize errors. However, it is also more prone to errors and internal misalignment issues. Phase detection is very fast and good at tracking moving subjects, since it doesn’t require much computational work from your camera.Each one has its own strengths and weaknesses: How does autofocus work at a technical level? You don’t need to know the science behind it unless you’re interested, but you still should be familiar with the two main types of autofocus systems today: phase detection and contrast detection. To focus manually, you need to turn a ring or similar mechanism on the lens instead. Automatic focus, or autofocus, is when the camera system drives a motor to move elements in your lens to change focus. (This is how extension tubes work for macro photography.)įocusing happens either automatically or manually. Along the same lines, if you physically move your lens farther from the camera, you’ll change where the plane of focus is positioned. With modern equipment, focusing typically takes place within your lens, which has glass elements inside that can move forward and backward to change the optical path of light. Any object in your photo that touches this window is said to be “in focus.” When you move the plane forward and backward to achieve your intended image, usually with your subject at maximum sharpness, that’s called focusing. Some people find it useful to think of the plane of focus like a window intersecting with the scene you’re photographing. This is the region in space with the potential to be as sharp as possible in a photo. In every photo you take, there will be a plane of focus. ![]()
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