1. Understanding the Basics
* Flash Power (Guide Number): A higher guide number indicates a more powerful flash, allowing you to illuminate subjects further away. You likely won't need a huge guide number for portraits, but it's good to be aware of.
* Flash Modes:
* TTL (Through-The-Lens): The camera automatically measures the light reflecting from the scene and adjusts the flash output accordingly. This is the most common and often easiest mode for beginners. However, it can be fooled by dark or reflective backgrounds.
* Manual: You control the flash power output (e.g., 1/1, 1/2, 1/4, 1/8 power). Requires more understanding but offers greater control and consistency.
* Flash Zoom: Adjusts the beam of light emitted by the flash. A narrower zoom concentrates the light for a longer range, while a wider zoom spreads the light for wider coverage and softer shadows.
* Sync Speed: The fastest shutter speed you can use with flash. Exceeding this speed will result in part of the image being blacked out. Typically around 1/200th or 1/250th of a second. Check your camera's manual.
* Flash Exposure Compensation (FEC): Allows you to fine-tune the flash output when using TTL mode. Positive values increase the flash power, and negative values decrease it.
2. Equipment
* External Flash: An external flash (speedlight) is significantly better than the built-in flash on your camera. It offers more power, flexibility, and the ability to be used off-camera. Brands like Godox, Canon, Nikon, and Sony are popular.
* Camera: Any DSLR or mirrorless camera with a hot shoe (the mount for the flash) will work.
* Lens: A fast lens (e.g., f/1.8, f/2.8) helps you gather more ambient light and allows for shallower depth of field. Focal lengths in the 35mm-85mm range are generally good for portraits.
* Light Modifier (Optional but Highly Recommended):
* Softbox: Creates a larger, softer light source, reducing harsh shadows.
* Umbrella: Similar to a softbox, but generally more portable. Shoot-through umbrellas soften the light, while reflective umbrellas bounce the light back towards the subject.
* Bare Bulb: Exposes all the light, can give a harsh but interesting effect, especially with gels
* Grid: Attaches to a flash, to focus the light into a beam.
* Off-Camera Flash Trigger (Optional): Allows you to use the flash away from the camera.
* Light Stand (Optional, but needed for off-camera flash): To hold your flash and modifier.
* Gels (Optional): Colored gels can add creative effects to your lighting.
3. Techniques
* On-Camera Flash (Direct Flash):
* Pros: Simple, portable.
* Cons: Can create harsh shadows, red-eye, and a flat, uninteresting look.
* How to Use:
* Set your flash to TTL mode to start.
* Experiment with Flash Exposure Compensation (FEC) to adjust the flash output. Often, dialing it down a bit (-1 or -2 stops) can make the light more natural.
* Use a diffuser attachment on your flash to soften the light.
* Bouncing: Tilt the flash head upwards and bounce the light off a ceiling or wall (if available). This creates a much softer and more flattering light. Note: This won't work well outdoors. However, bouncing flash is a great option if you are indoors.
* Off-Camera Flash (OCF):
* Pros: More control over light direction and quality, allows for more creative lighting setups.
* Cons: Requires more equipment and practice.
* How to Use:
1. Set up your trigger: Attach the transmitter to your camera's hot shoe and the receiver to your flash.
2. Position the Flash: Experiment with different angles. Common positions include:
* 45-Degree Angle: Place the flash at a 45-degree angle to the subject and slightly above their eye level. This is a classic and flattering setup.
* Side Lighting: Position the flash to the side of the subject to create more dramatic shadows.
* Backlighting: Place the flash behind the subject to create a rim light or silhouette.
3. Choose a Modifier: Attach your softbox, umbrella, or other modifier to the flash.
4. Set Flash Power: Start with a low flash power (e.g., 1/16 or 1/32) and increase it as needed. You can use a flash meter for precise measurement, but trial and error works too.
5. Manual Camera Settings: Switch your camera to manual mode.
* Aperture: Choose an aperture that gives you the desired depth of field (e.g., f/2.8 for a shallow depth of field, f/5.6 for more of the scene in focus).
* Shutter Speed: Set your shutter speed to your camera's sync speed (e.g., 1/200th of a second).
* ISO: Adjust the ISO to brighten or darken the background ambient light. A lower ISO will reduce noise and increase detail.
4. Camera Settings
* Shooting Mode: Manual (M) is generally recommended for the most control. Aperture Priority (Av/A) can work if you're comfortable with how your camera handles flash exposure.
* Aperture: A wider aperture (e.g., f/1.8, f/2.8) creates a shallow depth of field, blurring the background and isolating your subject. A smaller aperture (e.g., f/5.6, f/8) will keep more of the scene in focus.
* Shutter Speed: Set to your camera's sync speed (usually 1/200th or 1/250th of a second). The shutter speed controls how much ambient light is captured. A faster shutter speed will darken the background, while a slower shutter speed will brighten it.
* ISO: Start with a low ISO (e.g., 100 or 200) to minimize noise. Increase the ISO only if you need to brighten the ambient light or use a faster shutter speed.
* White Balance: Set to "Flash" or "Tungsten" for more accurate colors when using flash. You can also adjust it in post-processing.
* Focus: Use single-point autofocus and focus on your subject's eyes.
5. Tips and Tricks
* feathering: Point your flash slightly away from your subject to reduce hotspots and create a more gradual falloff of light.
* Ratio of Ambient to Flash: Consider the balance between the existing light and the flash. Do you want the background to be dark and dramatic, or do you want it to be more visible? Adjust your shutter speed and flash power to achieve the desired effect.
* Inverse Square Law: The intensity of light decreases rapidly as the distance from the light source increases. Move your flash closer to the subject for brighter light, and further away for softer light.
* Practice: Experiment with different flash positions, power settings, and modifiers to see what works best for you.
* Use Gels: Add color gels to your flash to create mood or match the existing ambient light.
* Shoot in RAW: This will give you more flexibility in post-processing, allowing you to adjust white balance, exposure, and other settings.
* Post-Processing: Use software like Adobe Lightroom or Photoshop to fine-tune your images. Adjust exposure, contrast, white balance, and sharpness to achieve the desired look. Reduce noise if necessary.
* Red Eye Reduction: Enable red-eye reduction on your camera or remove it in post-processing.
* Communicate with Your Subject: Tell your subject what you're trying to achieve and give them clear instructions.
Example Scenarios
* Basic Night Portrait with On-Camera Flash:
* Camera: Manual Mode
* Aperture: f/2.8 or f/4
* Shutter Speed: 1/200th of a second
* ISO: 200-400
* Flash: TTL mode, FEC -1 or -2 stops, diffuser attached.
* Try bouncing the flash if indoors
* Dramatic Night Portrait with Off-Camera Flash:
* Camera: Manual Mode
* Aperture: f/2.8
* Shutter Speed: 1/200th of a second
* ISO: 100
* Flash: Manual mode, 1/8 power, 45-degree angle to the subject, softbox attached.
Key to Success
The most important thing is to practice and experiment! Don't be afraid to try different things and see what works best for your style and the specific conditions you're shooting in. The more you practice, the more comfortable you'll become with using flash and the better your night portraits will be. Good luck!