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How does auto focus work on a camera?

Contrast-detection autofocus is achieved by measuring contrast (vision) within a sensor field through the lens. The intensity difference between adjacent pixels of the sensor naturally increases with correct image focus. The optical system can thereby be adjusted until the maximal contrast is detected.

Does autofocus depend on camera or lens?

The autofocus detection is within the camera body but the physical changes to the focus take place within the lens. There are various means of detecting focus. Some are based on the image sensor information (common to mirrorless cameras) while others are based on devices located in the cameras viewfinder.

What is the auto focus point of a camera?

An AF point is a specific part of the frame where the camera is able to focus on something. When looking through the viewfinder, these points are denoted by small squares clustered around the centre of the frame.

When should you use auto focus?

In general, autofocus systems are far quicker than manual focusing. In action scenarios, where there are moving objects, such as in scenes with sports players running or birds in flight, autofocus is generally more suited.

How does a camera know when its in focus?

Light comes into the camera. Light hits the Autofocus (AF) sensor. The AF sensor determines if the scene appears in focus. If its not in focus, it tells the AF motor to move the lens element(s) in the direction it thinks will bring the scene into focus.

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