BebuLamar wrote:
If you're taking portrait under full bright sun (sunny 16 condition) and the sun cast ugly shadow under the nose and chin how much power of a flash do you need to fill in the shadow given you are shooting a distance of about 6ft from the subject and you use f/5.6 or f/8. ISO and shutter speed your choice.
With your sunny 16 condition I assume your aperture would be f/16. A pleasing light ratio of roughly 3 to 1 would put your fill flash between f8 and f11. The additional flash would likely require an ISO offset (lower) or a smaller aperture to compensate.