R5 and RF 100-500 eye autofocus issues

[ekviera]

Hello. I have recently encountered issues with the RF 100-500 eye auto focus. The last two outings, I have tried to use the eye auto focus and the 100-500 lens does not lock on the eye. I can then switch to the RF 800 f/11 and the eye auto focus works without issue. The first time it happened I checked to see if I needed to update the firmware on the lens/camera. There was a firmware update for the R5 so I applied it and hoped that would work. I went out again this past weekend and had the same issues with eye autofocus not working. Any suggestions on what could be happening?

Thanks,

Eric

[p4pictures]

Firstly for the EOS R5 eye autofocus only works when the camera AF method is set to face + tracking, or you have a back button configured to eye detection AF and use that. 

With the RF 800mm F11 lens you only see a central frame where AF is working. For the RF 100-500mm the whole frame is used to detect the subject. 

EOS R5 and EOS R6 (original "mark I" versions)

• Eye detection only works with face + tracking AF
• Subject detection works with face + tracking or any of the three Zone AF areas
• There is no subject tracking or face / eye detection with spot AF, 1-pt AF, AF with expansion