Black Balance

I'm trying to figure out how often and when I should be doing a black balance on the AF100.

Do all the following scenarios warrant a black balance?

1) Change in White Balance
2) Change in ISO
3) Turning camera Off and then On again for a lens change
4) Turning camera On first time of the day.

I'm also wondering if its possible to do a black balance without doing a white balance at the same time? If I'm not mistaken, every time I hold down the button to the a black balance it will do a white balance first right?

Danai
 
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