OGsPhotography said:
I resized the images in the OP, the SOOC was wrong photo, oops.
I had adjusted the BG light using Histogram, perhaps I should pull it to the left just a tiny bit accounting for how close the stool is to the BG.
Ahhhh...replacing the SOOC image with the corect one, un-adjusted, shows
a slightly dim face, and a VERY white background. So, let's discuss the AS-SHOT pic from today: As-shot, the face exposure is "under" by a bit, and the background paper is rendered pure, detail-free, clean white. NOT so,so bright that a lot of white light is coming back and wrapping aroundher head and giving 1) blowback or 2) lens flaring or 3)both--but the ratio of the lights is not quite optimized. There is more light than needed to make a white paper render as white coming from the speedlight aimed at the paper. There is not quite the right exposure/light given to the face...that exposure is a bit dark. When the face is 'lifted', that drives the white paper backdrop to be a bit more-white than needed.
When a speedlight is aimed at a white paper from a CLOSE range like this, and the subject is also close to that background, the rate of falloff is very, very rapid, and a foot more or less distance from the backdrop paper can mean a stop's difference at close distances. If she were farther in front of the paper, it would still be white. Basically, the backgroung light on white papper, is a bit too intense.(It would probably be white if the papper were med. gray.)
It's a multi-sided coin: your backdrop paper has too much light on it for the lens exposure (f/stop with flash) you gave the face side. Or the light on the face should have been doubled in intensity, at least, to bring that intensity "up" to that of the background.
The tricky part is mixing the types of lights, and their beams. At close-dance, a speedlight can give a very intense, concentrated, narrow-angle of light that delives a LOT of power...while a large octa like that with say a 150 W-S monolight can deliver a softer, much less-intense light that is spread over a wide area.
The key is first, to avoid too-bright a backdrop, one that blasts a LOT of light back and around the head of the sitter, and you did successfully avoid that pitfall. The second goal would be to have a little bit brighter face exposure or a little bit more light on the face. If the face is a bit dark, and you lighten up the whole frame, then there's a chance that the backgroud light will become too strong.
You are working in a demanding, cramped shooting area. The speedlight that close to the paper, and the white-already paper being that close to her means that light meter readings at her ear-distance will vary a LOT if she scoots back just 6 inches on the stool, or slides forward a foot and sits on the front edge of the ottoman. My idea would be to MOVE THE speedlight off to the side, and set it on wide beam, so the Inverse Square Law will work more in your favor. As close as the speedlight and paper/sitter are, the more hyper-critical the backdrop exposure becomes.
The backdrop is
already white paper, so it needs less light than you might think to keep it white.
You could have cut the power in half, and moved the speedlight off to the side, and given the FACE side more Watt-seconds of light OR more f/stop (wider aperture), and nailed this perfectly, and it would have looked, SOOC, just as in my re-envisioning.
This is like one big circle. She's a bit too close to the backdrop AND she was not close enough to the main light. Or, the main light needed a doubling of its output in Watt-seconds. Or you could have moved her forward and cut the backdrop speedlight down 1.5 stops, and raised the ISO up one level. And so on and so on. ISO, f/stop, light power, light distance, actual reflective tone of the background paper; it is all interrelated. It can be complicated to discus this stuff in few words, since there are two, different exposures being combined in just ONE camera exposure setting.
This is where an incident light meter reading on her face of say f/8.0 would set the exposure, and a reflected light flashmeter reading taken from the camera distance, off of the backdrop paper, at f/11 or +1.0
over the face f/stop would yield a clean white backdrop that is not too hot.