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David Busch’s Canon® EOS 50D Guide to Digital SLR Photography by David D. Busch

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Chapter 10. Canon EOS 50D: Troubleshooting and Prevention

One of the nice things about modern electronic cameras like the Canon EOS 50D 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 one of the advantages of the 50D’s 1.6X crop factor) that flips up and down with each shot.

Of course, the camera also has a moving shutter that can ...

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