EF 24-70mm F2.8 USM L Lense auto focus not working

[limvo05]

Dear Experts, I accidentally dropped my camera with the lens attached. Now, I'm discovering the auto focus is no longer working. Any idea how to fix it? Is it worth fixing? To repair, where can I send it to? Thank you.

[limvo05]

I like the way you're thinking. As you can see from the photo, Autofocus is also not working for live view. I have tried detach the lens from the camera and leave it off for a few mins. Nothing seems to help 😞

[deebatman316]

Does it AF with the viewfinder. Does the focus distance scale on the lens move when the lens tries to AF. Does the lens even try to AF at all.

[limvo05]

No, AF is definitely not working for viewfinder and live view. There is no movement in the distance scale, the only time it move is when I manually focusing the lens. 

[deebatman316]

You may have a broken Ring Type USM AF motor though usually they rarely fail. A Ring Type USM AF motor doesn't use gears to adjust focus like Micro Motor lenses do. Instead its two rings one is a rotor the other is a stator. When power is applied to the rotor it causes it to turn and adjust focus. The stator is a stationary part and doesn't move only the rotor moves. 

[deebatman316]

Have you tried using the AF-ON Button?

[shadowsports]

Demetrius,

Excellent diagnostics 👍

[deebatman316]

Thanks Rick. 

[limvo05]

I have tried all possible combinations. When connected to another lens, the autofocus work fine with a different lens. It's only this lens (EF 24-700mm F/2.8L II USM) where the autofocus is not working. And it's the lens that was attached to the camera when it felled out. Re the Ring Type USM AF motor, I assumed that can be repaired for fixed.

Much appreciated your help on this. Thank you!

[deebatman316]

The lens will have to be repaired by Canon. Its unusual to hear a Ring Type USM motor go out. Get a quote first before going ahead with repairs. There's nothing much to a Ring Type USM AF motor to wrong like older lenses which use gears. The motor may have to be replaced. Please mark an answer as a solution too.

[limvo05]

I have reached out to Canon and they quoted me $399 for the repair job OUCH! But what can I do. The lens is super sharp before the incident. Hopefully, I'll get many more years out of if still. Much appreciated your help and others. Cheers.