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I'm taking self-portraits using Yongnuo speedlights as my lighting. I would like to light the background for better separation. I tried using a bare flash at 1⁄32 power at 85mm, but the falloff is too hard.

My background is a muslin hand-painted background. I'm trying to achieve the traditional portrait look.

What modifiers should I look at? Would a snoot help, and which direction to I position the light and snoot? Or would putting an 18" octagon soft box behind the subject achieve the effect?

  • This is a great question as is, but it'd be made even better by an example of what you've got so far. Care to share? – mattdm Dec 24 '14 at 15:58
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Don't think of the background light as just a background light. Play with it.

If you double the distance you will diminish the fall-off.

Your settings

You will need to double the output, and probably put a card so you don't spill light to your subject.

Double the distance

But play with the light, cut a cardboard in different shapes.

Play

From different angles

Play

Put a diffuser before the cardboard, remove the diffuser, move the distance to the screen, to the cardboard, the angle.

You can also construct a snoot just wrapping cardboard around your flash head.

Take a time to shoot not your portrait, but to shoot just backgrounds.

After you play with background's illumination probably you need to separate a bit more the subject from the background, because the light of the main subject will contaminate the background. Again, play with the distances.


I'm adding this part. Lighting the background will not add "separation" on its own. Playing with the illumination on the background will give you an ambient, hopefully it will add some mood or a story to your portrait.

But to "separate it" you need to play with the illumination between your model and the background. A hair light; a shadow-light vs light-shadow scheme perhaps; or narrower DOF.

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You need softer "diffuse" light. Easiest is to shoot near a white wall and/or ceiling and bounce the flash at higher power and wider angle off the surface. For more control buy an umbrella and mount, a reflector and something to hold it, or step up to a real soft-box.

Great tutorials for shooting with speedlights at http://strobist.com.

  • I'm confused — other than the possibility of finding the answer at Strobist somewhere, how does this answer the question about lighting the background for separation? Won't shooting near a white wall just spill more light everywhere? – mattdm Dec 24 '14 at 11:57
  • The primary problem in the question seems to be about creating diffuse light. The desired effect on the background can be achieved bouncing a focused speedlight off a white reflector (including wall/ceiling) behind the subject. Of course it can't compare with the control of using a monolight and soft boxes, but somebody using a Yongnuo speedlight is probably interested in cheaper solutions. – feetwet Dec 24 '14 at 14:01

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