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New Contributor
Posts: 1
Registered: ‎01-19-2018

Auto Focus Help needed

Hello Forum I need your help.  We bought a C300 Markii recently and I'm learning the camera which should be great once I learn it.  However, I cannot seem to change the AF Speed.  I currently have the camera's focus set to: 

AF Mode: Continuous

AF Frame Position: Selectable

AF Frame Size: Small 

Face Detection & Tracking: Face Only

AF Speed is Grayed out when I do select grayed out AF Speed it displays error message "This function is not compatible with current lens."  However, I've tried multiple lenses including the Canon 85mm 1.2 and the 16-35mm F2.8.  Btw, I am running the current firmware 1.1.


Any advice would be awesome....


Product Expert
Product Expert
Posts: 693
Registered: ‎10-17-2012

Re: Auto Focus Help needed

Hello Canwill35, 


According to the Canon Knowledge Base article linked here, these are not compatible lenses for the adjustable AF speed function.  I am sorry for any inconvenience that this may cause you. 


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