1. Understanding the Basics:
* Light Falloff: Light falls off rapidly as distance increases. This means the closer your light is to your subject, the brighter it will be, and the more dramatic the shadows will be.
* Inverse Square Law: (Simplified) Double the distance, and you get 1/4 the light. This is important to understand when positioning your flash.
* Ambient Light: This is the existing light in the scene (sunlight, room lights, etc.). You need to balance your flash power with the ambient light to achieve your desired look.
* Modifier Importance: A light modifier helps soften and spread the light. A bare flash can be harsh and unflattering.
2. Essential Equipment:
* Speedlight (Flash): A portable, battery-powered flash unit.
* Light Stand: To position your flash off-camera.
* Trigger: (Wireless or Wired) To fire the flash remotely from your camera. Wireless triggers are much more flexible.
* Light Modifier: (Softbox, Umbrella, Reflector) This is *crucial* for softening the light. A softbox is generally preferred for portraits because it creates more controlled, even light. An umbrella is more portable and spreads the light wider. A reflector can bounce the flash's light.
* Optional: Reflector: Even with a modifier, a reflector can bounce light back into shadows, creating a more balanced look.
3. Camera Settings:
* Shooting Mode: Manual (M) is generally best for control. You control the aperture, shutter speed, and ISO.
* Aperture: Controls depth of field (blurring the background).
* *Wider aperture (e.g., f/2.8, f/4):* Shallow depth of field, blurred background, isolates the subject.
* *Smaller aperture (e.g., f/8, f/11):* Deeper depth of field, more of the scene in focus.
* Shutter Speed: Controls ambient light and how the flash freezes motion. Important: Find your camera's flash sync speed. Typically 1/200th or 1/250th of a second. If you exceed this speed, you'll get a black band in your image (due to the shutter curtain not fully being open when the flash fires).
* *Faster shutter speed (1/200th):* Blocks more ambient light. Flash becomes more dominant.
* *Slower shutter speed (1/60th):* Allows more ambient light in, creating a more balanced look.
* ISO: Keep it as low as possible (ISO 100 or 200) to minimize noise. Increase only if necessary to get a proper exposure.
* White Balance: Set it appropriately for the scene (e.g., Daylight, Cloudy, Flash).
4. Flash Settings:
* Manual Mode (Flash): Start with manual flash mode. This gives you the most control over the light output.
* Flash Power: Start with a low power (e.g., 1/16, 1/8) and take test shots. Adjust the power until you get the desired brightness on your subject. Increase power for brighter light, decrease for dimmer light.
* Zoom: Adjust the flash zoom to control the spread of the light. Zooming in concentrates the light, zooming out spreads it. This is less important when using a modifier, as the modifier primarily controls the light spread.
5. Positioning Your Flash and Subject:
* Off-Camera Flash is Key: Get your flash *off* your camera. This is the biggest step in improving your portrait lighting. On-camera flash is often harsh and unflattering.
* Common Lighting Setups:
* Classic Rembrandt Lighting:
* Position the flash at a 45-degree angle to the side of your subject and slightly above their head. This creates a triangle of light on the cheek opposite the light source. This is a very flattering and popular setup.
* Use a reflector to bounce light into the shadow side of the face to soften the shadows.
* Butterfly Lighting:
* Position the flash directly in front of your subject and slightly above their head. This creates a small, butterfly-shaped shadow under the nose.
* Requires careful power control to avoid harsh shadows.
* Side Lighting:
* Position the flash directly to the side of your subject. This creates dramatic shadows and emphasizes texture. Good for artistic and moodier portraits.
* Use a reflector on the opposite side to fill in the shadows.
* Distance to Subject: The closer the light is to the subject, the softer the light and the faster the falloff. The further away, the harder the light and the more even the coverage.
* Height of the Light: Adjusting the height of the light affects the position of the shadows. Higher light creates shadows under the chin and nose. Lower light fills in those shadows.
6. Steps to Take a Portrait:
1. Set up your equipment: Light stand, flash, trigger, modifier.
2. Position your subject: Consider the background and pose.
3. Position your flash: Choose a lighting setup (Rembrandt, Butterfly, Side Lighting).
4. Set your camera to Manual mode: Choose an aperture for your desired depth of field. Set your shutter speed at or below your flash sync speed. Set your ISO as low as possible (start at 100).
5. Set your flash to Manual mode: Start with a low power setting (e.g., 1/16).
6. Take a test shot: Evaluate the exposure and lighting.
7. Adjust the Flash Power: If the image is too dark, increase the flash power. If it's too bright, decrease the flash power.
8. Adjust camera settings: Fine-tune aperture, shutter speed, or ISO if needed, but primarily adjust the flash power for optimal exposure. Adjusting the shutter speed will mainly change the ambient light level, not the flash.
9. Check Shadows: Use a reflector to fill in shadows if they are too harsh.
10. Focus and Shoot!
Tips and Tricks:
* Shoot in RAW: RAW files retain more image data, giving you more flexibility in post-processing.
* Look for Catchlights: Catchlights are the small reflections of light in your subject's eyes. They add life and sparkle to portraits. Position your light to create pleasing catchlights.
* Feather the Light: "Feathering" the light means positioning the modifier so that the center of the light beam falls *just* outside the subject's face. This creates a softer, more gradual transition from light to shadow.
* Backdrops: A clean, simple backdrop is ideal. A roll of seamless paper is a good option. You can also use a natural background, but make sure it's not too distracting.
* Practice: Experiment with different lighting setups, flash power levels, and camera settings. The more you practice, the better you'll become at creating fantastic portraits with a single flash.
* Post-Processing: Basic adjustments in post-processing (brightness, contrast, white balance, sharpening) can enhance your portraits.
Common Mistakes to Avoid:
* Using On-Camera Flash: It's harsh and unflattering.
* Exceeding Your Flash Sync Speed: This results in a black band in your image.
* Not Using a Modifier: Bare flash is rarely flattering for portraits.
* Overpowering the Flash: A subtle flash can be much more effective than an overpowering one. Don't try to blast away all the ambient light unless you're going for a specific dramatic effect.
* Ignoring Ambient Light: Consider the ambient light in the scene and balance it with your flash.
* Not Focusing on the Eyes: Sharp focus on the eyes is crucial for a compelling portrait.
By understanding these principles and practicing regularly, you can create stunning portraits using just one flash. Good luck!