Autofocus, shutter, sensor and processor
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Autofocus, shutter, sensor and processor

Let's start with some of those big internal advances. First off, the EOS-1D X Mark III has an all-new autofocus system for use with the optical viewfinder. It offers the same coverage as the Mark II, but with 191 points, of which 155 are cross-type. For the first time, this secondary sensor uses conventional square pixels, rather than dedicated 'strip' detectors.

The camera will focus through the viewfinder with telephoto-lens-and-teleconverter combinations down to F8. The overall system has been enhanced with machine learning for body and head detection, yet simplified, with fewer customizable autofocus 'cases' and a new 'Case Auto' mode that automatically adjusts parameters on the fly without any input needed from the user.

The shutter mechanism has been redesigned, with the goal of giving users less blackout while shooting bursts than the previous model, even while shooting at a faster burst speed. It's still rated to 500k shots, so should be plenty durable. There's a menu option to enable an electronic front-curtain shutter if you're concerned about shutter shock, but we haven't found any sign of this yet in our limited time with the camera.

Though there's the same ~20MP of resolution we've seen before, the sensor has been updated and offers faster readout speeds. So if you want to take advantage of the silent, fully electronic shutter, you'll find that rolling shutter artifacts are pretty well controlled. The new Digic X processor is many, many times faster than the dual Digic 6+ units in the previous camera. Together, the sensor and processor combine to unlock 20fps burst shooting with AF / AE in live view (16fps through the viewfinder), as well as some pretty impressive video specs...