They don’t do anything more than a Digital Rebel. But they do do it better sometimes, and that is important when you shoot for a living. They are more waterproof and more shockproof and shoot faster. And they have several other neat functions that can really matter.
Look at this shot here, from a commercial shoot I just did:
No idea what happened to the bottom right corner: bad sector on the disk, perhaps?
That is why the 1-series cameras, like my 1D Mark IV and my 1Ds Mark III, can write to two memory cards at once. I always do this. Sometimes the same format to both, sometimes large RAW to one and small RAW or even JPG to the other. That way I still have one when the other one has a problem.
If you do not have a 1-series or similar camera that can write to two cards, what do you do?
- Change memory cards regularly
- Format them every time you re-insert into the camera
- of course, backup, backup, backup.
But you knew that.