9. Canon Digital Rebel XTi: Troubleshooting and Prevention

One of the nice things about modern electronic cameras like the Canon Digital Rebel XTi is that they have fewer mechanical moving parts to fail, so they are less likely to “wear out.” No film transport mechanism, no wind lever or motor drive, no complicated mechanical linkages from camera to lens to physically stop down the lens aperture. Instead, tiny, reliable motors are built into each lens (and you lose the use of only that lens should something fail), and one of the few major moving parts in the camera itself is a lightweight mirror (its small size is one of the advantages of the XTi’s 1.6X crop factor) that flips up and down with each shot.

Of course, the camera also has a moving shutter that can fail, but the shutter is built rugged enough that Canon confidently predicts its useful life at tens of thousands of shutter cycles. Unless you’re shooting sports in continuous mode day in and day out, the shutter on your XTi is likely to last as long as you expect to use the camera.