I. Understanding the Basics
* Light is King: The quality and direction of light are what make or break a portrait. One flash means you have to be strategic about controlling that light.
* Inverse Square Law: The intensity of light decreases by the square of the distance. This means that moving the flash even a little bit can drastically affect the light falloff and shadows on your subject. Be aware of this relationship.
* Flash Power Control: You need to be able to adjust the flash power. A dedicated speedlight will give you manual control. Avoid relying solely on the camera's built-in flash as it's generally unflattering.
* Light Modifiers: A modifier is anything that changes the quality (size, shape, diffusion) of the light. This is crucial for one-flash portraiture.
II. Essential Equipment
* External Flash (Speedlight/Strobe): Get an external flash that you can adjust manually (power levels). Consider one with high speed sync (HSS) for outdoor use.
* Light Stand: To position the flash independently from your camera.
* Trigger (Optional, but Recommended): A wireless trigger allows you to fire the flash off-camera, giving you more flexibility. Cheaper radio triggers work well for basic setups. TTL triggers are more sophisticated but not required.
* Light Modifier (Essential): Choose one or more from the list below:
* Umbrella (Shoot-Through or Reflective): Inexpensive and great for creating soft, broad light. Shoot-through umbrellas soften the light more. Reflective umbrellas (white inside) bounce the light, making it a bit more directional. Larger umbrellas create softer light.
* Softbox: Provides more controlled and even light compared to an umbrella. The shape (square, rectangle, octagon) influences the catchlights in the subject's eyes.
* Beauty Dish: Creates a more focused, slightly harder light with a beautiful, gradual falloff. Often used in beauty and fashion photography.
* Reflector (White, Silver, Gold): Not technically a flash modifier, but essential for bouncing light back onto your subject to fill in shadows. White is the most natural and subtle. Silver is brighter and more specular. Gold adds warmth.
* Grid: A honeycomb-like attachment that narrows the light beam, creating more dramatic and focused light.
* Snoot: A tube that creates a very small, concentrated circle of light.
III. Basic Lighting Setups & Techniques
1. 45-Degree Angle Lighting (Classic):
* Place the flash (with modifier) on a light stand at a 45-degree angle to the subject, slightly to the side and slightly above their head.
* Adjust the power until the subject is properly exposed.
* Use a reflector on the opposite side to fill in the shadows.
* Why it works: This creates a flattering light with good dimension and highlights.
2. Side Lighting (Dramatic):
* Position the flash to the side of the subject, illuminating only one side of their face.
* This creates strong shadows and a dramatic, moody look.
* Can be softened with a large modifier, or left harsher for more intensity.
3. Rembrandt Lighting:
* Similar to 45-degree lighting, but the light is positioned so that a small triangle of light appears on the cheek opposite the light source.
* Adds depth and mystery.
4. Clamshell Lighting (Beauty):
* Requires a reflector as the second light source.
* Place the flash (with modifier) above and slightly in front of the subject, pointing down.
* Place the reflector below the subject, angled upwards to fill in shadows under the chin and eyes.
* Creates even, flattering light with minimal shadows.
5. Backlighting (Rim Lighting):
* Position the flash behind the subject, pointing towards the camera.
* This creates a bright outline (rim light) around the subject's hair and shoulders.
* Requires careful exposure to avoid overexposing the background.
* Use a reflector in front of the subject to add some fill light to their face.
6. Bouncing the Flash:
* Point the flash (without a modifier in this case) at a nearby wall or ceiling.
* The light will bounce off the surface and create a softer, more diffused light on the subject.
* Caution: Be mindful of the color of the surface you're bouncing off of. A colored wall will tint the light.
IV. Key Considerations & Tips
* Flash Power: Start with a low flash power and increase it gradually until you achieve the desired exposure. This helps prevent overexposure.
* Distance: The closer the flash is to the subject, the softer the light. The further away, the harsher.
* Backgrounds: Choose a background that complements your subject and doesn't distract from them. Dark backgrounds work well with dramatic lighting.
* Catchlights: Pay attention to the catchlights in the subject's eyes. They add life and sparkle to the portrait. The shape and position of the catchlights can be influenced by the shape and position of your light source.
* White Balance: Set your camera's white balance to "Flash" or use a gray card to ensure accurate colors.
* Practice: Experiment with different setups and modifiers to see what works best for you. The more you practice, the better you'll understand how light affects your images.
* Shoot in Manual Mode: Use manual mode on your camera (ISO, aperture, shutter speed) and adjust your flash power separately. This gives you complete control.
* High-Speed Sync (HSS): If shooting outdoors in bright sunlight, HSS allows you to use faster shutter speeds than your camera's sync speed (typically 1/200th or 1/250th of a second). This lets you use wider apertures for shallow depth of field without overexposing the image. However, HSS reduces flash power.
V. Example Workflow (45-Degree Lighting)
1. Setup: Place your subject in front of a clean background.
2. Position Flash: Set up your light stand with the flash and umbrella (shoot-through) at a 45-degree angle to the subject, slightly above their head.
3. Camera Settings (Example):
* ISO: 100-400 (keep it low to minimize noise)
* Aperture: f/2.8 - f/5.6 (depending on desired depth of field)
* Shutter Speed: 1/125th - 1/200th (or your camera's sync speed)
4. Flash Power: Start with a low flash power (e.g., 1/16 or 1/32) and take a test shot.
5. Adjust:
* If the image is underexposed, increase the flash power or open the aperture slightly.
* If the image is overexposed, decrease the flash power or close the aperture slightly.
6. Reflector: Position a reflector on the opposite side of the subject to fill in shadows. Adjust the angle and distance of the reflector to control the amount of fill light.
7. Focus and Compose: Focus on the subject's eyes and compose the shot.
8. Shoot!
VI. Common Mistakes to Avoid
* Harsh Shadows: Use a modifier or reflector to soften shadows.
* Overexposure: Start with low flash power and adjust gradually.
* Red Eye: Position the flash further away from the lens axis or use a red-eye reduction feature (though it's best to avoid red-eye altogether).
* Distracting Backgrounds: Choose a clean and uncluttered background.
* Incorrect White Balance: Set your camera's white balance to "Flash" or use a gray card.
* Not Using a Modifier: The raw, direct light from a flash is almost always unflattering.
By understanding these principles and experimenting with different techniques, you can create stunning and professional-looking portraits using just one flash. Remember to practice and have fun!