I. Equipment & Setup:
* One Off-Camera Flash (Speedlight/Strobe): A speedlight is the most common and portable option. A strobe offers more power and consistent color temperature, but usually requires a power pack.
* Light Stand: Essential for positioning your flash off-camera.
* Light Modifier (Crucial):
* Umbrella (Shoot-Through or Reflective): Affordable, easy to set up, and provides a soft, broad light source. Shoot-through umbrellas soften the light more, while reflective umbrellas offer slightly more directionality.
* Softbox: Creates a controlled, soft light with less light spill than an umbrella. Rectangular softboxes mimic window light.
* Beauty Dish: Creates a flattering light with a focused beam and slightly harder shadows than softboxes or umbrellas. Great for portraits with defined features.
* Bare Bulb: (Advanced) Produces a very harsh, dramatic light. Requires careful positioning to avoid unflattering shadows.
* Grids & Snoots: Used to control the spread of light, directing it precisely onto the subject. Useful for highlighting specific areas.
* Trigger System (Wireless):
* Radio Triggers (Recommended): Offer reliable communication between your camera and flash, even in bright sunlight or crowded environments. Brands like Godox, PocketWizard, and Yongnuo are popular.
* Optical Slave: Triggers the flash when it detects another flash firing. Less reliable outdoors and in bright light.
* Built-in TTL: Some cameras offer on-camera TTL (Through-the-Lens) that can remotely trigger flashes, but this often requires the flash to be in the same room and can be unreliable.
* Reflector (Optional but Highly Recommended): A white, silver, or gold reflector helps bounce light back onto the subject, filling in shadows and adding dimension.
* Light Meter (Optional but Helpful): A light meter helps you precisely measure the light output and set your flash power and camera settings accordingly.
* Background (Consideration): Choose a background that complements your subject and doesn't distract from them. Simple backdrops are often best.
* Camera & Lens:
* Camera: Any DSLR or mirrorless camera with manual mode will work.
* Lens: A portrait lens (e.g., 50mm, 85mm, 105mm) is ideal, but you can still get great results with a kit lens. A wider aperture (e.g., f/2.8, f/1.8) helps blur the background.
II. Basic Lighting Positions (Examples):
* Key Light: The main light source illuminating your subject. Typically placed to the side of the subject, slightly above eye level.
* 45-Degree Angle: The most common starting point. Position the light stand about 45 degrees to the side and slightly in front of your subject. This creates a pleasing balance of light and shadow.
* Butterfly Lighting: Place the light directly in front of the subject, slightly above and behind them. This creates a small, butterfly-shaped shadow under the nose. Very flattering for many faces.
* Loop Lighting: Similar to butterfly lighting, but move the light slightly to one side. The nose shadow will form a small loop on the cheek.
* Rembrandt Lighting: Position the light further to the side so that a triangle of light appears on the cheek opposite the light source. Creates a dramatic, sculpted look.
* Reflector (Shadow Fill): Position a reflector opposite the key light to bounce light back into the shadows. The angle and distance of the reflector will affect the amount of fill.
* Backlighting/Rim Lighting (Advanced): Place the flash behind the subject, aiming towards the camera. This creates a bright outline (rim light) around the subject, separating them from the background. Requires careful power control to avoid overexposure. Using a grid or snoot helps control the light spill.
III. Camera and Flash Settings (Manual Mode):
* Camera Settings:
* Mode: Set your camera to Manual (M) mode.
* Aperture: Choose an aperture that provides the desired depth of field. Wider apertures (e.g., f/2.8, f/1.8) blur the background, while smaller apertures (e.g., f/5.6, f/8) keep more in focus.
* ISO: Keep the ISO as low as possible (e.g., ISO 100, ISO 200) to minimize noise.
* Shutter Speed: Set your shutter speed to the maximum sync speed of your camera (usually 1/200th or 1/250th of a second). This is the fastest shutter speed you can use with flash without getting banding in your image. You can use *slower* shutter speeds to bring in more ambient light, but faster speeds won't work properly. Shutter speed controls how much ambient light you capture.
* Flash Settings:
* Mode: Set your flash to Manual (M) mode. This gives you the most control.
* Power: Start with a low power setting (e.g., 1/16, 1/32) and gradually increase it until you get the desired exposure. Use a light meter if you have one.
* Zoom: Adjust the zoom head on the flash to control the spread of light. Zooming in will focus the light, while zooming out will spread it.
* TTL (Optional): If your flash and trigger support TTL, you can use it as a starting point, but be prepared to adjust the exposure compensation on the flash.
IV. Workflow & Tips:
1. Set Up Your Scene: Position your background, subject, and light stand.
2. Dial in Ambient Exposure: With the flash *off*, set your aperture, ISO, and shutter speed to achieve the desired background exposure. You might want the background to be slightly underexposed to make the subject stand out.
3. Position and Test Your Light: Place the flash in the desired position and take a test shot. Adjust the flash power and position until you get the desired lighting on your subject.
4. Reflector Adjustments: If using a reflector, experiment with its position and angle to fill in shadows and add dimension.
5. Focus and Shoot: Focus on your subject's eyes and take the shot.
6. Review and Adjust: Review the image on your camera's LCD screen and make adjustments to your flash power, position, camera settings, and reflector as needed.
7. Take Lots of Pictures: Don't be afraid to experiment and try different lighting positions.
8. Post-Processing: Use photo editing software (e.g., Adobe Lightroom, Capture One) to fine-tune your images.
V. Key Concepts to Understand:
* Inverse Square Law: The intensity of light decreases rapidly as the distance from the light source increases. Moving the flash closer to your subject will dramatically increase the light intensity.
* Light Quality: Soft light (from a large light source like an umbrella or softbox) produces gradual transitions between light and shadow, while hard light (from a bare bulb) produces sharp, defined shadows.
* Color Temperature: Different light sources have different color temperatures. Flash is generally around 5500K (daylight). If mixing flash with ambient light (e.g., indoor lights), you may need to adjust the white balance in your camera or use color gels on your flash to match the color temperatures.
* Feathering: Aiming the *edge* of the light at your subject, rather than the center. This can soften the light and create a more gradual transition.
VI. Advanced Techniques:
* Gels: Use colored gels on your flash to create dramatic effects or to correct the color temperature.
* Multiple Exposures: Combine multiple images to create more complex lighting effects.
* High-Speed Sync (HSS): (If your flash and camera support it) Allows you to use shutter speeds faster than your camera's sync speed, which is useful for shooting with flash in bright sunlight with a wide aperture. However, HSS reduces the flash's power output.
VII. Practice and Experimentation:
The key to mastering one-light portrait photography is practice. Experiment with different lighting positions, modifiers, and camera settings to find what works best for you. Don't be afraid to make mistakes – that's how you learn. Start with simple setups and gradually work your way up to more complex ones. Watch tutorials, read articles, and study the work of other portrait photographers. Good luck!