Canon EOS 5D IV: What you need to know
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Canon EOS 5D IV: What you need to know

One key area where the EOS 5D IV outshines pretty much all DSLRs today is autofocus in live view and video. The Mark IV’s Dual Pixel AF system brings rapid and consistently reliable focus in both modes, and unlike the flagship EOS-1D X II, the 5D IV can offer continuous tracking in live view mode for stills, in addition to the incredible capable movie servo AF during video recording. Based on the time we've spent with preproduction Mark IV's, we are very impressed with just how responsive the Dual Pixel system is - take a look at how easy it is to select subjects and track them reliably in our video here.

That sort of subject tracking outclasses the camera's own viewfinder AF in some ways, not to mention the far greater frame coverage and accuracy of on-sensor AF. Frankly, Dual Pixel AF is so good we'd often prefer it over viewfinder AF (for anything but sports), but alas using a DSLR at arm's length isn't very practical.

By comparison, the contrast-detection live view and video AF system of most DSLRs, like the 5D III and all Nikon offerings, is slow, prone to hunting, and cannot offer any kind of reliable continuous focusing.