I. Understanding Your Equipment and Environment
* Your Flash (Speedlight/Strobe): Know its power settings (full, 1/2, 1/4, etc.) and how to adjust them. Consider the flash's guide number (which indicates its power output), though you'll likely rely more on experimentation and visual feedback.
* Triggering: How will you fire the flash?
* On-Camera Flash (Direct): Least desirable for flattering portraits, but useful in a pinch.
* Off-Camera Flash: Provides more control and better light. Requires a trigger:
* Wireless Triggers (Radio/Optical): Most reliable and flexible. Radio triggers are generally preferred as they aren't affected by line-of-sight issues like optical triggers.
* Sync Cord: A wired connection. Reliable but limits your mobility.
* Light Modifiers (Crucial): These shape and soften the light. Essential for flattering portraits.
* Softbox: Creates a large, soft light source. Rectangular or octagonal shapes are common.
* Umbrella: More portable and affordable than softboxes. Can be shoot-through (translucent) or reflective (silver/white).
* Beauty Dish: Produces a circular, soft light with a bit more contrast and a defined edge.
* Bare Bulb: Harshest light. Can be used creatively but requires careful placement and feathering.
* Reflector (White/Silver/Gold): Bounces light back onto your subject, filling in shadows. Can be used with or without a flash.
* Gels (Optional): Change the color of the light.
* Your Camera: Understand aperture, shutter speed, ISO, and white balance. Shoot in manual mode for the most control.
* Your Location: Consider the ambient light, background, and available space.
II. Key Concepts: Exposure Triangle & Flash Power
* Aperture (f-stop): Controls depth of field and the amount of light from *both* ambient and flash that hits the sensor. Wider apertures (smaller f-number) let in more light, create shallower depth of field (blurred background), and require less flash power. Narrower apertures (larger f-number) do the opposite.
* Shutter Speed: Primarily controls the amount of *ambient* light in the photo. *It doesn't affect flash exposure*. A faster shutter speed will darken the background. The highest shutter speed that will work with your flash is the "flash sync speed" of your camera (usually around 1/200th or 1/250th of a second). Exceeding it will create a dark bar at the top or bottom of your image.
* ISO: Controls the sensor's sensitivity to light. Higher ISO values allow you to shoot in darker situations, but can introduce noise (grain).
* Flash Power: The intensity of the flash burst. The lower the power, the faster the recycle time.
III. Basic Lighting Setups with One Flash
Here are a few fundamental setups:
* 1. 45-Degree Angle (Classic Portrait):
* Place the flash *off-camera* at a 45-degree angle to your subject, slightly above eye level.
* Use a softbox or umbrella to diffuse the light.
* Have the subject angled slightly toward the light source.
* Benefits: Creates pleasing shadows that define the face.
* Adjustments:
* Move the light closer or further away to adjust its intensity.
* Change the flash power.
* Use a reflector on the opposite side to fill in shadows.
* 2. Rembrandt Lighting:
* Similar to the 45-degree angle, but position the light slightly *further* to the side.
* The goal is to create a small, inverted triangle of light on the cheek furthest from the light source.
* Benefits: Dramatic and flattering.
* Adjustments: Fine-tune the light position to achieve the perfect triangle.
* 3. Butterfly/Clamshell Lighting:
* Place the flash *directly in front* of your subject, slightly above and angled down.
* Use a softbox or beauty dish.
* Place a reflector *below* the subject, reflecting light back up into their face.
* Benefits: Creates even lighting with a small butterfly-shaped shadow under the nose.
* Adjustments: Adjust the height and angle of the flash and reflector.
* 4. Backlighting/Rim Lighting:
* Position the flash *behind* your subject, aiming toward the camera.
* This creates a bright outline around the subject, separating them from the background.
* Benefits: Dramatic and can be used to create silhouettes.
* Adjustments: Adjust flash power and position to control the rim light. Use a reflector in front of the subject for a subtle fill.
* 5. On-Camera Flash (Bounce Flash):
* If you *must* use on-camera flash, *bounce it off a ceiling or wall* (preferably white or light-colored).
* Tilt the flash head upwards or to the side.
* Benefits: Softer light than direct flash, but still not as flattering as off-camera.
* Adjustments: Adjust flash power and bounce angle. Use a small bounce card on the flash head to kick some light forward.
IV. Shooting in Manual Mode (Recommended)
* 1. Set Your Aperture: Choose an aperture based on your desired depth of field. For portraits, f/2.8 to f/5.6 is a good starting point.
* 2. Set Your Shutter Speed: Start at your camera's flash sync speed (e.g., 1/200th or 1/250th of a second). Adjust it to darken or brighten the *background*.
* 3. Set Your ISO: Start at a low ISO (e.g., 100) to minimize noise. Increase it if needed to brighten the overall image.
* 4. Adjust Flash Power: Start with a low flash power (e.g., 1/16 or 1/32) and take a test shot. Increase the flash power until the subject is properly exposed.
* 5. Review and Adjust: Check your histogram and adjust aperture, shutter speed, ISO, and flash power as needed.
* Important: The shutter speed controls ambient light; the aperture controls overall light; and the flash power controls the light on your subject.
V. Tips for Better Portraits
* Feathering the Light: Aim the edge of the light towards your subject, rather than the center. This often creates a softer, more pleasing light.
* Inverse Square Law: Light intensity decreases dramatically with distance. Moving the flash twice as far away reduces its intensity to one-quarter. Keep this in mind when positioning your light.
* Backgrounds: Choose backgrounds that complement your subject and don't distract from them. Use shallow depth of field to blur the background.
* Posing: Pay attention to posing. Experiment with different angles, expressions, and body language. Guide your subject. Avoid having subjects face the camera head-on; slightly angled faces are more flattering.
* Catchlights: The small reflections of the light source in the subject's eyes. They add life and sparkle to the portrait. Make sure you have catchlights!
* White Balance: Set your white balance appropriately. Flash is typically around 5500K (daylight). Adjust it in-camera or in post-processing.
* Shoot in RAW: Allows for greater flexibility in post-processing.
* Post-Processing: Use software like Adobe Lightroom or Photoshop to adjust exposure, contrast, color, and sharpness. Remove blemishes and distractions.
* Practice, Practice, Practice: Experiment with different settings, lighting setups, and poses. The more you practice, the better you'll become.
VI. Common Mistakes to Avoid
* Direct Flash: Creates harsh shadows and flat lighting. Avoid it unless you're bouncing the flash.
* Too Much Flash Power: Can blow out highlights and create an unnatural look.
* Ignoring Ambient Light: Ambient light can contribute to the overall mood and atmosphere of the portrait.
* Bad Posing: Unflattering poses can ruin a good portrait.
* Neglecting the Background: A distracting background can draw attention away from the subject.
* Over-Processing: Avoid over-sharpening, over-smoothing skin, and other extreme edits.
By understanding these principles and practicing regularly, you can create stunning portraits with just one flash. Good luck and have fun!