Find Strobist: Lighting 101 is very helpful. I am confused while I am reading this article
Strobist: Lighting 101: Balancing Flash and Ambient, Pt 1
The author mentioned dropping the ambient down by two stops to build an underexposed ambient-light. How about the flash power? Adjust the flash output till get right exposure on the subject 's face, so that we can have a separation between the subject and the background. Do I understand it right?
And in the comments below the article,
Thomas Pickard tried to answer others' question. He keeps using f-stops to describe the flash output. This really confuse me. I only see fraction (1/1, 1/2, 1/8....) for manual and exposure compensation (-3 to +3) for TTL mode.