My lens stopped auto focusing?!?!

[Rowee]

I have a Canon 35-105mm USM lens and it randomly decided to stop autofocusing the other day?!
It hasn't been dropped or anything, i can't understand why it would happen. ive checked all the connectors on the lens and they seem fine, other lenses work on my camera so its definitely the lens. I have noticed though, that the movement when zooming is getting stiff, could this be the problem, and can you loosen it/clean it??

 

[OutLore]

Have you cleaned the electrical connectors on the lens? Failing that, it might need to go in for service....

Silly question - does the lens have a manual focus override switch?

 

[michaelgreen78]

Have you cleaned the electrical connectors on the lens? Failing that, it might need to go in for service....

Silly question - does the lens have a manual focus override switch?

Those were all my first thoughts, especially the last bit - the af/mf selector switch on the lens. Which way is it pointing?

 

[Rowee]

I have cleaned the connectors on the lens - yes it does have a manual/auto switch, set to AF - still no luck. The camera wont take the pic when on auto so the camera knows its on auto and out of focus, the motor just doesnt kick in

 

[OutLore]

Can you try the lens on another body? Anyone you know have a Canon which will operate it correctly?

 

[Cathus]

Does the 30D have a custom function to stop AutoFocus where you can change what type of focus happens when you half-press the shutter?

If so, when this is set it turns off AF, you may have set it accidentally?

 

[Rowee]

i will have to double check that, though when i put other lenses on, they AF fine :bang: im thinking maybe the issue lies with the lens :shrug:

 

[Rowee]

Found the problem, the focus ring was jammed, took a bit of pressure to move it but the AF is workin again Think you may be right, service required. Thanks for your help + suggestions

 

[Rowee]

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[medwaygreen]

Looks like your post key is jammed now.