New patent reveals how the Canon EOS R3 eye-detection AF may work

Canon Eye Control AF
(Image credit: Japan Patent Office)

The Canon EOS R3 looks set to be one of the most eagerly anticipated Canon camera launches yet, and the latest snippet in a steady trickle of teasers, rumors, speculation and soundbites is this patent application by Canon.

Picked up on by Canon News, this patent shows how Canon might solve a tricky issue of integrating an eye-detect sensor into an electronic viewfinder without affecting the viewfinder image quality.

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Rod Lawton

Rod is an independent photography journalist and editor, and a long-standing Digital Camera World contributor, having previously worked as DCW's Group Reviews editor. Before that he has been technique editor on N-Photo, Head of Testing for the photography division and Camera Channel editor on TechRadar, as well as contributing to many other publications. He has been writing about photography technique, photo editing and digital cameras since they first appeared, and before that began his career writing about film photography. He has used and reviewed practically every interchangeable lens camera launched in the past 20 years, from entry-level DSLRs to medium format cameras, together with lenses, tripods, gimbals, light meters, camera bags and more. Rod has his own camera gear blog at but also writes about photo-editing applications and techniques at