![]() However, because they are full-frame cameras, their AF point coverage for viewfinder shooting doesn’t cover as much of the frame as the 45-point AF system in the EOS 90D. It minimizes the problem of the camera inadvertently focusing on a distant background instead of a human subject, and perhaps even more important, is a great aid to ensure sharp focus actually falls upon a face - and not part of a subject’s clothes, or an accessory like a hat a that a subject may be wearing.įace Detect AF is a capability that Canon DSLRs have had before, but until now, it was limited to full-frame cameras like the EOS 5D Mark IV and EOS-1D X Mark II. This can be a remarkable way to quickly put focus on faces, without taking the time to manually move an AF point or a zone of points from one part of the frame to another. ![]() For our discussion, however, we want to turn to its ability to read actual subject and scene information, and provide that info to the EOS 90D’s 45-point AF system. This same RGB metering sensor does an excellent job of exposure control, and reads and controls E-TTL flash exposure as well. It can read color information, and now has sufficient pixel resolution to recognize human faces - not just skin tones - when viewing and composing through the viewfinder. With 220,000 pixels, the metering system can do far more than simply measure brightness. (The previous EOS 80D model had a much simpler RGB light metering sensor, with 7,560 pixels.) Think of this light metering sensor as a tiny “imaging sensor,” obviously much smaller and with far fewer pixels than today’s high-res image sensors. The metering sensor is now a 220,000 pixel RGB sensor, located near the viewfinder in the prism area of the camera. ![]() Canon engineers have stepped-up the EOS 90D’s basic exposure metering system, and this plays a major role in its AF capabilities with Face Detection as well.
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