E4 in the D7100 is Exposure Compensation For Flash which allows you to choose how the camera adjusts flash level when exposure compensation is used. Within the E4 setting, there are two adjustment called entire frame and background only. With entire frame, both flash level and exposure compensation are adjusted to modify exposure over the entire frame while background only applies exposure compensation applies the background. In order to darken the background the exposure compensation on the flash would need to be lowered therefore weakening the flash output. To do this, shooting does not have to be in manual. If both are adjusted then the outcome would be additive.
If you have anymore questions on lighting, please see the following article on lighting magic.: http://www.nikonusa.com/en/Learn-An...
answered 1 month, 3 weeks ago
1 month, 3 weeks ago