I. Essential Gear:
* Camera: A DSLR or mirrorless camera with manual mode controls (aperture, shutter speed, ISO) and a hot shoe for your flash.
* Flash (Speedlight/Speedlite): A portable flash unit with manual power control is essential. TTL (Through-The-Lens) can be helpful, but understanding manual is key.
* Light Stand: To get the flash off-camera for more creative lighting.
* Flash Trigger: (Highly Recommended) A wireless trigger set to control the flash remotely. These are generally much more effective than optical slave triggers, and allow you to move your flash wherever you want, even outside of the camera's line of sight. Radio triggers work best.
* Light Modifier: This is crucial! Examples:
* Umbrella (Shoot-Through or Reflective): Inexpensive and versatile. A shoot-through umbrella creates soft, broad light. A reflective umbrella directs light back towards the subject.
* Softbox: Creates soft, directional light with more control than an umbrella. Rectangular softboxes are great for portraiture.
* Beauty Dish: Creates a flattering, focused light with a soft edge. Good for more dramatic portraits.
* Bare Bulb: No modifier, will give you a harsh shadow, but it can be manipulated in interesting ways.
* Optional but Helpful:
* Reflector: Bounces light back onto the subject, filling in shadows. A white, silver, or gold reflector can modify the light's color.
* Gels: Colored gels can add creative effects.
* Grid: Narrows the beam of light, adding even more directional control.
* Snoot: Creates a small, focused circle of light.
* Light Meter: Although you can "chimp" and figure out the correct setting, a light meter will allow you to quickly determine the appropriate power for your flash.
II. Understanding the Fundamentals:
* Exposure Triangle (Aperture, Shutter Speed, ISO):
* Aperture: Controls depth of field (the area in focus). Wider apertures (e.g., f/2.8, f/4) create shallow depth of field, blurring the background.
* Shutter Speed: Controls the duration of light exposure. It primarily affects ambient light (the existing light in the scene). With flash, it has less impact on the subject, as the flash duration is much shorter. *However, your shutter speed must be at or below your camera's sync speed.* Exceeding this will result in a black bar in your images. The sync speed is typically around 1/200th or 1/250th of a second.
* ISO: Controls the camera's sensitivity to light. Keep it as low as possible to minimize noise.
* Flash Power: This controls the intensity of the flash. Start with a low power setting and adjust upwards as needed.
* Inverse Square Law: The intensity of light decreases rapidly as the distance from the light source increases. If you double the distance from the flash to the subject, the light intensity drops to one-quarter.
III. Setting Up Your Shot (Step-by-Step):
1. Choose Your Location: Consider the background. A simple, uncluttered background is often best. A backdrop can be helpful if shooting indoors.
2. Position Your Subject: Decide where you want your subject to stand or sit.
3. Camera Settings (Manual Mode):
* ISO: Start at your camera's lowest native ISO (usually 100 or 200).
* Aperture: Choose an aperture based on your desired depth of field (e.g., f/2.8 for blurry background, f/5.6 for more sharpness).
* Shutter Speed: Set your shutter speed to your camera's sync speed (or slightly below).
4. Ambient Light: Take a test shot without the flash. Adjust your shutter speed to control the ambient light. A slower shutter speed will let in more ambient light, making the background brighter. A faster shutter speed will darken the background. *Your goal is to balance the ambient light with the flash.*
5. Position the Flash and Light Stand: Here are some classic placement options:
* 45-Degree Angle (Classic): Place the flash (with your modifier) on a light stand, about 45 degrees to the side of your subject and slightly in front of them. Angle the flash slightly downwards. This creates flattering light and shadows.
* Side Lighting: Position the flash directly to the side of your subject. This creates more dramatic shadows and highlights.
* Overhead Lighting (Clamshell): Place the flash above and slightly in front of your subject, angled down. Use a reflector below the subject to bounce light back up and fill in shadows under the chin.
* Behind the Subject (Rim Light/Backlight): Place the flash behind the subject, pointing towards them. This creates a rim of light around the subject's edges, separating them from the background. You will need a hair light to keep the front of their face well lit.
6. Set the Flash Power: Start with a low flash power (e.g., 1/32 or 1/64). Take a test shot.
7. Adjust Flash Power:
* If the subject is too dark: Increase the flash power.
* If the subject is too bright: Decrease the flash power.
8. Reflector (if using): Position the reflector opposite the flash, bouncing light back onto the subject's shadowed side.
9. Fine-Tune: Continue adjusting the flash power, position, and modifier until you achieve the desired look. Pay attention to the shadows. Soft light creates subtle shadows; hard light creates harsh shadows.
IV. Key Lighting Techniques:
* Key Light: The main light source illuminating the subject.
* Fill Light: Used to soften shadows created by the key light (can be a reflector, a second flash, or ambient light). With one flash, you're primarily using the reflector or ambient light as fill.
* Catchlight: The reflection of the light source in the subject's eyes. It adds life and sparkle.
V. Creative Ideas & Tips:
* Feathering the Light: Instead of pointing the flash directly at the subject, angle it slightly away. This will soften the light and create a more gradual falloff.
* Experiment with Modifiers: Try different modifiers to see how they affect the light. A beauty dish will give you a different look than a softbox.
* Gels: Use colored gels to add creative effects. A blue gel can create a cool, moody look.
* Backgrounds: Pay attention to your background. Use a wide aperture to blur the background, or choose a background that complements your subject. You can even light the background separately with your flash.
* Composition: Use the rules of composition (rule of thirds, leading lines, etc.) to create visually appealing portraits.
* Pose: Guide your subject into natural and flattering poses.
* Eye Contact: Encourage your subject to make eye contact with the camera.
* Practice: The more you practice, the better you'll become at understanding light and creating beautiful portraits.
* Diffusion: Experiment with a "silk" (a large diffusion panel) and shoot your flash through the silk from a distance. This can create a very large, soft, and flattering light source.
VI. Common Problems & Solutions:
* Harsh Shadows: Use a larger light modifier, move the light source closer to the subject, or use a reflector to fill in the shadows.
* Red Eye: Increase the distance between the flash and the lens, or use an on-camera flash with red-eye reduction mode.
* Hot Spots: Adjust the flash power or move the light source further away from the subject.
* Underexposed Images: Increase the flash power, lower the shutter speed (watch sync speed), or increase the ISO.
* Overexposed Images: Decrease the flash power, raise the shutter speed, or lower the ISO.
* Unnatural Skin Tones: Make sure your white balance is correct. If you're shooting in RAW format, you can adjust the white balance in post-processing.
VII. Post-Processing:
* RAW Format: Shoot in RAW format for maximum flexibility in post-processing.
* Adjust Exposure, Contrast, and White Balance: Make subtle adjustments to improve the overall look of the image.
* Retouching: Remove blemishes, smooth skin, and enhance the eyes.
* Sharpening: Add a small amount of sharpening to bring out details.
In summary, creating fantastic portraits with one flash is about mastering the fundamentals of light, understanding how to use modifiers, and practicing your technique. Don't be afraid to experiment and try new things!