i am considering of using an automatica flashlight to do fill-in
flash. in many cases, the add-in flash should be in the similar
amounts of the ambient light on the shadow which i hope bring one stop
lighter. so the flahs to sunlight radio is about 50-to-50. to archive
this, i need to know, does the sensor count ambient light? the
different answer will lead to different setup of aperture.

thanks.

-
woody