1. Understanding the Goal: Balancing Flash with Ambient Light
The key to great night portraits with flash is to *balance* the light from your flash with the existing ambient light. You don't want the flash to completely obliterate the background and create a harsh, artificial look. You want it to *supplement* the existing light, creating a natural and flattering image.
2. Equipment You'll Need:
* Camera: A DSLR or mirrorless camera with a hot shoe for mounting an external flash. A camera with good high ISO performance is also beneficial.
* External Flash: This is crucial. On-camera pop-up flashes are generally too harsh and offer little control. Look for an external flash that offers TTL (Through-The-Lens) metering and manual power control.
* Flash Modifiers (Highly Recommended):
* Softbox or Umbrella: These diffuse the light, creating a softer, more flattering look on your subject. Even a small, portable softbox is a huge improvement.
* Diffuser (Built-in or Aftermarket): A small diffuser that attaches directly to the flash head can soften the light a bit.
* Bounce Card: A simple white or silver reflector that you can hold or attach to the flash to bounce the light.
* Light Stand (Optional but Helpful): If you want to position the flash off-camera, you'll need a light stand.
* Wireless Flash Trigger (Optional): Allows you to fire the flash off-camera without a direct connection to the camera. This gives you greater flexibility in positioning the flash.
* Tripod (Optional but Recommended): Helps keep your camera steady in low light situations, especially when using slower shutter speeds to capture more ambient light.
3. Camera Settings:
* Shooting Mode:
* Aperture Priority (Av or A): This mode allows you to control the depth of field by setting the aperture. Start with a wide aperture (e.g., f/2.8, f/4, f/5.6) to create a blurred background.
* Manual (M): Gives you complete control over aperture, shutter speed, and ISO. This is often preferred by experienced photographers for consistent results.
* Aperture: As mentioned above, start with a wide aperture (lower f-number) to blur the background. Adjust as needed to achieve the desired depth of field.
* Shutter Speed: The shutter speed controls how much ambient light is captured. Adjust it to brighten or darken the background. *Don't exceed your camera's flash sync speed* (typically 1/200th or 1/250th of a second). If you do, you'll get a black band in your image.
* ISO: Keep your ISO as low as possible to minimize noise. Increase it only when necessary to achieve a good exposure. A good starting point is ISO 400 or 800, and adjust from there.
* White Balance: Set the white balance to "Auto" or "Flash". You can also experiment with other white balance settings to achieve a specific look.
* Metering Mode: Evaluative/Matrix metering is a good starting point, but experiment with spot metering if you want to fine-tune the exposure.
4. Flash Settings:
* TTL (Through-The-Lens) Mode: Start with TTL mode. This allows the camera and flash to communicate and automatically adjust the flash power. It's a good starting point for beginners.
* Flash Exposure Compensation (FEC): FEC allows you to fine-tune the flash power in TTL mode. If your subject is overexposed, reduce the FEC (e.g., -0.3, -0.7). If your subject is underexposed, increase the FEC (e.g., +0.3, +0.7).
* Manual Mode (M): Once you gain more experience, switch to manual mode for greater control. Start with a low power setting (e.g., 1/64, 1/32) and gradually increase it until you achieve the desired exposure. This gives you consistent results.
* Flash Zoom: Adjust the flash zoom to match the focal length of your lens. Zooming the flash head concentrates the light, while widening the zoom spreads it out.
* Flash Recycle Time: Pay attention to your flash's recycle time. If you're shooting rapidly, you may need to wait for the flash to recharge between shots.
5. Flash Techniques:
* On-Camera Flash (Direct Flash): This is the easiest, but also the least flattering. Direct flash can create harsh shadows and make your subject look flat. Use a diffuser to soften the light if you have to use direct flash. Tilt the flash head upwards slightly to bounce the light off the ceiling (if indoors).
* Bouncing Flash: Bouncing the flash off a wall or ceiling creates a softer, more natural light. Angle the flash head to bounce the light towards your subject. Be aware of the color of the surface you're bouncing off, as it can affect the color of the light.
* Off-Camera Flash: Using the flash off-camera provides the most creative control. Place the flash to the side of your subject to create more flattering shadows and dimension. Use a light stand and a wireless flash trigger to position the flash. A softbox or umbrella is essential for softening the light.
* Rear Curtain Sync (Second Curtain Sync): This mode fires the flash at the end of the exposure, which can create interesting motion blur effects. Experiment with slow shutter speeds to capture the motion.
6. Workflow and Tips for Night Portraits with Flash:
* Find a Good Location: Look for locations with interesting ambient light and backgrounds. Streetlights, neon signs, and architectural lighting can all add to the atmosphere.
* Communicate with Your Subject: Let your subject know what you're trying to achieve and give them clear instructions.
* Take Test Shots: Always take test shots to check your exposure and flash settings. Adjust as needed.
* Adjust Shutter Speed for Ambient Light: Adjust the shutter speed to control how much of the background ambient light is captured. Slower shutter speeds will brighten the background, while faster shutter speeds will darken it.
* Adjust Flash Power for Subject Lighting: Adjust the flash power (either through FEC in TTL mode or by setting the power manually) to properly illuminate your subject.
* Focus Carefully: In low light, focusing can be challenging. Use autofocus assist lights or manually focus if necessary.
* Shoot in RAW: Shooting in RAW gives you more flexibility in post-processing. You can adjust the white balance, exposure, and other settings without losing image quality.
* Post-Processing: In post-processing, you can fine-tune the exposure, white balance, and contrast to create a polished final image. Reduce noise if necessary.
Example Scenario:
Let's say you're shooting a portrait of someone in front of a building with interesting architectural lighting.
1. Set Up: Position your subject in front of the building. If you have a light stand, position your flash with a softbox slightly to the side of your subject. If using on camera flash, use a bounce card.
2. Camera Settings: Set your camera to Aperture Priority (Av) mode, an aperture of f/2.8, an ISO of 400, and your camera's flash sync speed (e.g., 1/200th of a second).
3. Flash Settings: Set your flash to TTL mode and start with Flash Exposure Compensation (FEC) at 0.
4. Take a Test Shot: Review the image. If the subject is too bright, reduce the FEC (e.g., -0.3, -0.7). If the subject is too dark, increase the FEC (e.g., +0.3, +0.7).
5. Adjust Shutter Speed: If the background is too dark, slow down the shutter speed to let in more ambient light. If the background is too bright, increase the shutter speed.
6. Fine-Tune: Continue adjusting the FEC and shutter speed until you achieve the desired balance of flash and ambient light.
Common Mistakes to Avoid:
* Overpowering the Flash: Using too much flash can make your subject look washed out and unnatural.
* Harsh Shadows: Direct flash creates harsh shadows. Use a diffuser or bounce the flash to soften the light.
* Red-Eye: Position the flash away from the lens axis to avoid red-eye.
* Ignoring the Background: Don't forget about the background. Make sure it's not too dark or too bright.
* Using the On-Camera Pop-Up Flash: This is the least flattering option. Invest in an external flash.
Practice, Practice, Practice!
The best way to learn how to use flash for night portraits is to practice. Experiment with different settings and techniques to see what works best for you. Don't be afraid to make mistakes – that's how you learn! Good luck!