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| p.1 #4 · Need some feedback on this portrait lighting |
3) Not lots of room, so backdrop 4-5 feet behind subject. On this photo, the left side of the back drop was hit with light and so I had to darken it in post. Sometimes the full backdrop was dark. I didn't play with moving the softbox further away. Mostly adjusted power. Any ideas on most probable cause?
The light was too far from the subject, causing the amount of fall-off between subject and background to be too small. Moving the light further away would have required an increase in power to keep the same amount of light on your subject, making the problem at the background worse.
If you move the light closer to your subject, and then decrease the power to get the same subject exposure, the amount of light falling on the background will be less. (It's that old Inverse Square Law at work.)
If that seems contrary to common sense, look at it this way:
Let's say your light is 5 feet from your wife, and your wife is 5 feet from the BG (the light is 10 feet from the BG). You have a 2:1 ratio. (10/5=2.)
If you move the light to only 2.5 feet from your wife, keeping the BG at 5 feet back, you will have a 3:1 ratio. (7.5/2.5=3.)
If you then move the light to just 1 foot from your wife, you will have a whopping 6:1 ratio. (6/1=6.)