I. Understanding the Basics
* Light Quality is Key: You're not just adding light; you're *shaping* it. The size and softness of your light source dramatically impact the mood and style of your portrait.
* Inverse Square Law: Understand that light intensity decreases rapidly with distance. Moving the flash closer to your subject makes the light brighter, but also softer. Moving it further away does the opposite.
* Ambient Light vs. Flash Light: You'll balance these two to create the desired effect. Think of them as ingredients in a recipe.
II. Essential Gear
* One Speedlight/Flash: This is your primary light source.
* Light Stand (Optional but Highly Recommended): Allows you to position the flash off-camera.
* Wireless Trigger (Highly Recommended): Frees you from needing a sync cable running from your camera to the flash. Look for TTL and HSS (High Speed Sync) compatibility if you want advanced features. Cheaper manual triggers are fine, too.
* Light Modifier (Essential): This is what softens and shapes the flash. Some options:
* Umbrella (Shoot-Through or Reflective): Inexpensive and creates broad, soft light. Shoot-through umbrellas place the flash facing the subject through the umbrella. Reflective umbrellas have the flash pointing at the inside of the umbrella, bouncing the light back towards the subject.
* Softbox: Creates a more controlled and directional soft light than an umbrella. Different sizes and shapes offer different effects.
* Beauty Dish: Creates a harder, more dramatic light with a distinctive specular highlight, popular in beauty and fashion.
* Bare Bulb: A very hard light, generally not flattering unless used creatively.
* Reflector (Optional but Useful): Bounces light back into the shadows, filling them and reducing contrast. A white or silver reflector is most common.
* Light Meter (Optional): Helps you precisely measure the flash and ambient light for accurate exposure. You can also use your camera's histogram or highlight alert.
III. Camera Settings
* Shooting Mode: Manual (M) is strongly recommended. This gives you complete control over aperture, shutter speed, and ISO.
* Aperture: Controls depth of field.
* Wide Aperture (e.g., f/1.8, f/2.8): Creates a shallow depth of field, blurring the background and isolating the subject. Requires more flash power.
* Narrow Aperture (e.g., f/8, f/11): Creates a larger depth of field, keeping more of the scene in focus. Requires less flash power.
* Shutter Speed: Primarily controls the amount of *ambient* light in your photo.
* Start around 1/60th to 1/200th of a second (or your camera's sync speed). Experiment to balance ambient light with the flash.
* If you want a darker background, use a faster shutter speed.
* If you want a brighter background, use a slower shutter speed.
* ISO: Keep it as low as possible (e.g., ISO 100) to minimize noise. Increase it *only if needed* to brighten the ambient exposure or when using smaller apertures.
* White Balance: Set it to match the flash (usually "Flash" or around 5500K). You can adjust in post-processing, but getting it right in-camera is better.
* Focus Mode: Single-point AF is generally best for portraits. Focus on the subject's eye closest to the camera.
IV. Flash Settings
* Flash Mode:
* Manual (M): Gives you the most control. You set the flash power (e.g., 1/1, 1/2, 1/4, 1/8, etc.). Start with a low power (like 1/16 or 1/32) and gradually increase it until the subject is properly lit.
* TTL (Through-the-Lens): The flash automatically meters the light and adjusts its power. It can be convenient, but less consistent than manual. Use flash exposure compensation (FEC) to fine-tune the flash output.
* Flash Power: Adjust this to control the brightness of the flash. Lower the power to make the light less intense. Increase the power to make it more intense.
* Zoom Head: (If applicable) Zooming the flash head narrows the beam, increasing intensity and creating a harder light. Widening the beam spreads the light, making it softer.
V. Basic Lighting Setups (One Flash)
* Side Lighting (45-degree Angle):
* Place the flash to one side of the subject, about 45 degrees from the camera's line of sight.
* This creates a more dramatic and sculpted look with shadows on the opposite side of the face.
* Use a reflector on the shadow side to bounce light back and soften the shadows.
* Frontal Lighting:
* Place the flash directly in front of the subject, slightly above eye level.
* Provides even illumination and is generally flattering, but can be a bit flat.
* Use a large modifier to soften the light and prevent harsh shadows.
* Rembrandt Lighting:
* Similar to side lighting, but the flash is positioned slightly further to the side and higher.
* Creates a small, inverted triangle of light on the cheek opposite the light source.
* Very flattering and creates a classic portrait look.
* Backlighting/Rim Lighting:
* Place the flash behind the subject, pointed towards the camera.
* Creates a halo effect around the subject, separating them from the background.
* Use a reflector in front of the subject to add light to their face.
* Bouncing:
* Aim the flash at a white ceiling or wall to diffuse the light and create a larger, softer light source.
* Requires more flash power, but results in a more natural-looking light.
* Beware of colored ceilings, as they will tint the light.
VI. Key Techniques & Tips
* Feathering the Light: Don't point the light directly at your subject. Instead, angle it slightly so that the *edge* of the light beam falls on them. This often results in softer, more flattering light.
* Observe the Shadows: Pay close attention to the shadows created by the flash. Are they too harsh? Too deep? Adjust the position of the flash and/or use a reflector to modify the shadows.
* Distance Matters: Moving the flash closer makes the light softer and brighter; moving it farther away makes the light harder and dimmer.
* Experiment with Modifiers: Try different modifiers to see how they affect the light. An umbrella will give you a broad, soft light, while a beauty dish will give you a more focused, dramatic light.
* Practice Balancing Flash and Ambient Light: This is crucial for creating natural-looking portraits. Adjust your shutter speed to control the ambient light and your flash power to control the light on your subject.
* Shoot in RAW: This gives you more flexibility in post-processing to adjust exposure, white balance, and other settings.
* Post-Processing: Use editing software (e.g., Adobe Lightroom, Capture One) to refine your images. Adjust exposure, contrast, white balance, and sharpness. Consider subtle dodging and burning to further shape the light.
* High-Speed Sync (HSS): If your flash and camera support it, HSS allows you to use faster shutter speeds than your camera's sync speed while using flash. This is particularly useful for shooting outdoors in bright sunlight with wide apertures.
VII. Troubleshooting
* Harsh Shadows: Soften the light by using a larger modifier, moving the flash closer to the subject, or using a reflector to fill in the shadows.
* Overexposed Images: Reduce the flash power or increase the distance between the flash and the subject. Check your ISO.
* Underexposed Images: Increase the flash power or decrease the distance between the flash and the subject. Open up your aperture or increase the ISO.
* Red Eye: Position the flash further away from the lens. Use a bounce flash. Use red-eye reduction in post-processing (though this is usually a last resort).
* Unnatural Skin Tones: Adjust your white balance to match the flash. Use a color checker to calibrate your camera.
VIII. Advanced Techniques (Once you're comfortable with the basics)
* Gels: Use colored gels on your flash to create different moods and effects.
* Multiple Exposures: Combine multiple exposures to create unique and surreal images.
* Creative Backgrounds: Use textured or colored backgrounds to add interest to your portraits.
* Off-Camera Flash Techniques: Experiment with more complex lighting setups using multiple flashes (though this is beyond the scope of using only one flash!).
In summary: Taking fantastic portraits with one flash is about understanding how light works and how to shape it to create the desired effect. Practice, experiment, and don't be afraid to try new things! Good luck!