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Multi-shot portrait by Alan Hess

Enthusiast’s Guide: Using a flash to create double exposures

Kevin Ames 08/09/2018 1

(Editor’s note: Photofocus is proud to add Rocky Nook as a vibrant contributor for our readers. Rocky Nook is a small — seven-person independent publishing company. Their commitment is producing high-quality books written by pros for photographers who want to learn more about their craft. Over the next eight weeks, Photofocus features a series on multi-shot photography from “The Enthusiast’s Guide to Multi-Shot Techniques” by Alan Hess.)

Using a flash to create double exposures

A great method for creating a double exposure look involves using a light painting technique to illuminate multiple subjects in the same exposure. You leave the shutter open and use a light source—such as a flash, a flashlight, or even a studio strobe—to illuminate the parts of the scene you want the camera to record. The “double exposure” part comes into play because you can move or change the subject or add new elements to the image during the exposure and expose the same area to light twice during a single exposure. Back when I was in college, I used this technique to take portraits of people talking to themselves on a single frame of film. It’s fun to create these images and you can get really interesting results.

Multiple shot self portrait by Alan Hess
This is a self-portrait I created in my living room with a camera, a tripod, and a single Nikon Speedlight.

The shutter stays open

The key to this technique is to keep the shutter open during the entire exposure and both flashes of light by using the Bulb shutter speed. Most DSLR cameras have a wide range of shutter speeds, from 1/4000 second all the way to 30 seconds, and a Bulb mode.

The Bulb mode allows the shutter to stay open for longer than the 30-second max that most DSLRs allow. It will remain open for as long as the shutter release button is pressed down. If you are using a remote shutter release, you can lock it so that the shutter stays open without you having to keep your finger on the shutter release button during the exposure.

As long as the shutter button is held down with the speed set to BULB, the shutter stays open.
This mode is depicted by the letter B or the word Bulb on the shutter speed display.

As a Nikon user, I use the MC-36 Multi-Function Remote Cord with my Nikon D4 because it allows me to do more than just trigger the shutter. You can use any camera remote that allows you to trigger and lock the shutter release. When the shutter is open, light is allowed to enter the camera, so I have two main tips that will help you create successful images with this technique. The first is that it helps to work in a very dark area. The second is to use something to cover the front of the lens to block the light between the “exposures.” You will want to block any light from entering the lens. I usually make a homemade lens cover that goes over the whole front of the lens. I start by cutting a cardboard circle a little bigger than the front of my lens, and then I cover it in black gaffer tape. I use the tape to make a big lip around the cardboard so that I can slip the cover over the front of the lens.

A homemade slip-on lens cover for mulit-shot photographs.

The cover doesn’t have to be pretty, but it does need to block out light and it should be easy for you to put it on the lens and take it off without moving the camera. You can also cover just part of the lens with a piece of black poster board when you fire the flash to block the light from portions of the scene. This prevents the light from reaching the sensor. If the two exposures (i.e., the two flashes) are going to take place in the same area, it’s helpful to use a tripod to keep the camera steady. I like to set up the scene and then lock the camera into position so that the only thing that changes between the two flashes is the main subject. This adds a sense of realism to an unrealistic scene.

Making the multi-shot scene

  1. Attach a cable shutter release to the camera.
  2. Set the shutter speed to Bulb.
  3. Set the ISO as low as possible (ISO 100).
  4. Set the aperture to f/16
  5. Mount the camera on a tripod and compose the scene
  6. Focus on the subject, then switch the camera to manual focus so that it doesn’t change focus when you take the photo
  7. Turn off all the lights to make the scene as dark as possible
  8. Press and lock the shutter release button on the cable release to open and lock the shutter
  9. Light the subject with the flash
  10. Cover the lens
  11. Move the subject
  12. Uncover the lens
  13. Light the subject a second time
  14. Close the shutter.

The resulting image is a single frame with two exposures created by the flash leads this article.

One of the great things about digital cameras is that they provide instant feedback so you can see how the image came out immediately. This allows you to experiment with the light placement, the position of the subject, and the power of the flash. Adjusting the power and direction of the light source allows you to fine tune the image and change how the subject looks. If there is too much light bleeding over to where the subject was positioned in the first frame, the background will show through the subject, making it look like a ghost (Figure 4.7). This technique is a lot of fun to experiment with. Although it is technically not a double exposure, you can get the overlay effect by moving not only the subject but the camera as well. Just make sure that you cover the lens while moving the camera or the subject.

Read more from Rocky Nook Enthusiast’s Guides.

  • About
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Kevin Ames

Photographer, Educator, Author at Kevin Ames Photography
Photography is life. Kevin is living it to the fullest. His practice includes fashion, editorial, architectural and corporate photography. Most of all he loves making photographs! Read his blogs here and at www.kevinamesphotography.com.

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Categories: Tutorials Tags: Enthusiast's Guide flash multiple Nikon Rocky Nook speed light

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  1. Amit Mahendu says

    August 10, 2018 at 5:50 am

    Thank you for sharing useful article.

     
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