Victoria,
You are right. Though I need confess I don't understand the reason for this. I didn't dabble much with the previous version but am impressed with this release so I am behind in this software.
Dave
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Turn it off it you don't need it Dave.
It's useful for:
Serial number - different calibration for different cameras within the same model, perhaps a different photographer likes a different look so other settings could be different too, perhaps you always use a certain lens on one camera which needs more sharpening, that kind of thing.
ISO - different noise reduction for different levels
You get the idea?