Cap Canon Lenses
Why will my DSLR's shutter button not work with the lens on?
I have a Canon XSi, that I've had for about a year. When I press the shutter button without a lens w/ the body cap, without a lens or body cap, and if I turn the camera on with the lens attached in manual focus the shutter will fire. As soon as I switch the lens to autofocus, the shutter key stops responding to presses even if I switch back to manual after a press on autofocus (This is the same for all 4 of my lenses, all of which work fine w/ autofocus on my Canon XT).
I did clean the contacts, I also noticed as I was waiting on hold for the canon support there was a firmware update available for the camera. From 1.0.9 to 1.1.0. After I did the update the autofocus started working again.. Thanks for getting me on the right track.
Generally this is due to dirty electrical contacts, either on the camera body itself or the lens (maybe both).
Do other lenses work okay? Your statement that all 4 of your lenses are the same and then you say work fine on your XT. This would indicate a problem with the contacts in the XSi body
If after cleaning those contacts the auto-focus still does not work, call Canon 800.OK-CANON and ask for help
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