Camera wont shoot in AF mode! HELP!

[Elliott]

Not sure if this is the right section but i need help...

Basically went to a car meet today, got the camera out stuck the lens and and it wouldnt take a photo! on AF is focus's perfect but it wont take a picture it just keeps re-focusing, but when i put it on MF it works fine and takes a picture so i know its not my lens?

Anyone know the issue here?

its a canon eos 20D

 

[ClickClocks]

try clean the contact (in the camera and in the Lens) one time happened to me and that was the problem. is just one lens or all the lens?

 

[natjag]

if it was a subject with little contrast, it would struggle. This could be a car, if the AF point is on a surface with no contrast, such as a car body panel, which is all one colour, there is no contrast.

 

[DizMatt]

have you cleaned the AF sensor at the bottom of the camera?
just below the mirror, get your blower and remove any bits and pieces on there

 

[Treesie]

If nothing is apparent, it's always worth resetting the camera to factory settings.