![]() ![]() A sub-mirror behind the main mirror reflects some light into a dedicated autofocus sensor. When you're using the viewfinder in a DSLR, the main reflex mirror reflects light into the viewfinder. Mirrorless cameras, including the full-frame mirrorless EOS R System cameras, work in the equivalent of Live View mode all the time, so they have just one AF system. One is used when images are composed in the viewfinder, and the other is used in Live View or video mode when the image is composed on the screen on the back of the camera. If you use a modern EOS DSLR, you may be unaware that it actually has two different AF systems. How AF works in a DSLR or a mirrorless camera Touch & drag AF settings (available on selected newer cameras including the EOS M50 Mark II and EOS R System models) – see the section below about specifying the AF point. Find out more about AF configuration options. On some cameras, a separate Subject tracking option must be enabled first. Subject to detect – on the latest cameras with Intelligent AF, this instructs the camera's AI to give priority to People, Animals, Vehicles or No Priority. Zone AF – uses auto selection AF within a larger area, optionally focusing on the nearest subject or using various criteria such as faces, subject motion and subject distance.Both of these are effective with moving subjects, which are difficult to track with 1-point AF With either, the camera focuses using a single AF point, but if it is unsure then it uses another AF point to assist, or may switch to that point instead – either the next point horizontally and vertically, or the next point diagonally as well. Expand AF area – there are two options here.Spot AF – the camera focuses using an even smaller area than 1-point AF.1-point AF – the camera focuses using a single AF point.On some cameras, this appears as a separate Subject tracking menu option ![]()
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