This is the primary system used when looking through the viewfinder. It features 61 AF points, with 41 of them being highly sensitive "cross-type" points that can detect both horizontal and vertical lines.
The center AF point is sensitive down to -3 EV , meaning it can find focus in lighting conditions so dim that the human eye might struggle. Live View & Video: Dual Pixel CMOS AF focus canon 5d mark iv
The Canon EOS 5D Mark IV Go to product viewer dialog for this item. This is the primary system used when looking
This system takes over when you switch to Live View or Video mode. It uses the camera's image sensor to perform phase-detection autofocus across approximately 80% of the frame, allowing for smooth, continuous tracking that was previously impossible on full-frame DSLRs. Viewfinder Focus: The 61-Point Powerhouse The viewfinder system in the 5D Mark IV Live View & Video: Dual Pixel CMOS AF