Making Beautiful Portraits with Flash and High-Speed Sync (HSS)
High-Speed Sync (HSS) is a powerful technique that allows you to use your flash at shutter speeds faster than your camera's maximum sync speed (usually 1/200th or 1/250th of a second). This opens up creative possibilities, particularly in bright daylight situations, allowing you to:
* Overpower the ambient light: Control the light in your scene, even when the sun is strong.
* Create shallow depth of field: Use wide apertures (e.g., f/2.8, f/1.8) in bright sunlight to blur the background and isolate your subject.
Here's a breakdown of how to make beautiful portraits using flash and HSS:
1. Understanding the Fundamentals
* Sync Speed: Your camera's maximum sync speed is the fastest shutter speed at which the entire sensor is exposed to the flash at the same time. Going above this speed without HSS will result in a dark band in your image.
* High-Speed Sync (HSS): HSS isn't actually a "sync" in the traditional sense. Instead of a single flash burst, HSS uses a rapid series of low-power flash pulses for the duration the shutter is open. This allows the sensor to be evenly illuminated at high shutter speeds, but it comes at a cost:
* Reduced Flash Power: The individual pulses are much weaker than a single flash burst, meaning you'll have less flash power available.
* Faster Battery Drain: Firing so many pulses drains your flash batteries more quickly.
2. Gear You'll Need
* DSLR or Mirrorless Camera: Most modern cameras support HSS. Check your camera manual.
* External Flash with HSS Support: Crucial! Your flash must explicitly state that it supports HSS. Examples include:
* Canon Speedlite 600EX II-RT
* Nikon SB-5000
* Godox V860II Series, AD200, AD400Pro, AD600Pro (require triggers)
* Profoto B10, B10 Plus, A1X
* Flash Trigger (Optional but Highly Recommended): For off-camera flash, you'll need a trigger system that supports HSS. Popular brands include:
* Godox XPro series
* Profoto Air Remote
* PocketWizard
* Light Modifier (Optional but Recommended): To soften and shape the flash light. Consider:
* Softbox (various sizes)
* Umbrella (shoot-through or reflective)
* Beauty Dish
* Reflector
* Light Stand (If using off-camera flash): To position your flash.
3. Camera Settings
* Shooting Mode: Manual Mode (M) is generally recommended for maximum control.
* Aperture: Choose your aperture based on the desired depth of field. Wider apertures (f/2.8, f/1.8) create shallow depth of field and blurred backgrounds, perfect for isolating your subject. Narrower apertures (f/5.6, f/8) will give you more depth of field.
* Shutter Speed: Set your shutter speed above your camera's sync speed (e.g., 1/400, 1/1000, 1/2000) based on the ambient light and desired effect. The faster the shutter speed, the more you'll overpower the ambient light and the less it will contribute to the exposure.
* ISO: Keep your ISO as low as possible to minimize noise. Start with ISO 100 and increase it only if necessary to achieve proper exposure.
* White Balance: Set your white balance based on the ambient light conditions. If you're shooting in RAW, you can adjust it later in post-processing.
4. Flash Settings
* Enable HSS: Consult your flash and camera manuals to enable HSS. The specific procedure varies depending on the brand and model. Often it involves navigating menus on the flash or camera.
* Flash Mode: Set your flash to TTL (Through-The-Lens) mode to let the camera meter the flash output automatically, or Manual mode for more precise control. TTL is often easier to start with.
* Flash Compensation: Use flash compensation to fine-tune the flash output. Start with 0 and adjust as needed based on the histogram and your visual preference. Positive values increase the flash power; negative values decrease it.
5. Positioning Your Subject and Flash
* Subject Placement: Consider your background and the light direction. Look for clean, uncluttered backgrounds.
* Flash Position (On-Camera vs. Off-Camera):
* On-Camera Flash: Simple and convenient, but can produce harsh shadows and a flat look. Diffusing the flash with a diffuser or bounce card helps soften the light. Tilt the flash head upwards and bounce the light off a ceiling or wall for a more natural look.
* Off-Camera Flash: More control over the light's direction and quality. Position your flash to the side and slightly in front of your subject for flattering light.
* Distance: Adjust the distance between the flash and your subject to control the light intensity. Closer equals more light.
* Light Modifiers: Use a light modifier to soften and shape the light. A softbox or umbrella will create a larger, more diffused light source.
6. Taking the Shot and Adjusting
1. Take a Test Shot: Review the image on your camera's LCD. Pay attention to:
* Exposure: Is the image too bright or too dark? Adjust the aperture, shutter speed, ISO, and flash compensation accordingly. Remember that in HSS, increasing shutter speed will primarily affect ambient light, not flash illumination.
* Flash Power: Is the flash overpowering the ambient light or not providing enough fill? Adjust the flash power (either manually or with flash compensation). Keep in mind that HSS has less power than normal flash.
* Shadows: Are the shadows too harsh? Move the flash further away, use a larger light modifier, or add a reflector to fill in the shadows.
* White Balance: Is the skin tone accurate? Adjust the white balance if needed.
2. Adjust and Repeat: Continue to adjust your settings and take test shots until you achieve the desired look.
3. Focus: Ensure your subject is in sharp focus. Use single-point autofocus and focus on the eye closest to the camera.
7. Key Considerations and Tips
* Power Management: HSS drains batteries quickly. Make sure you have fresh batteries or an external power pack for your flash.
* Ambient Light Measurement: Before setting up your flash, meter the ambient light. This helps you decide how much you need to overpower it. Use the camera's meter or a handheld light meter.
* Light Falloff: Remember that light falloff is more pronounced with HSS because of the lower flash power. Position your flash closer to your subject or increase the flash power if necessary.
* Practice, Practice, Practice: Mastering HSS takes practice. Experiment with different settings and techniques to find what works best for you.
* Start Simple: Don't try to do too much at once. Start with one light and a simple light modifier.
* Post-Processing: Don't be afraid to adjust your images in post-processing. You can fine-tune the exposure, white balance, contrast, and other settings to create a polished final product.
Example Scenario: Outdoor Portrait in Bright Sunlight
1. Goal: Create a portrait with a blurred background using a wide aperture (f/2.8) in bright sunlight.
2. Camera Settings:
* Mode: Manual (M)
* Aperture: f/2.8
* ISO: 100
* Shutter Speed: Start at 1/1000 (higher than sync speed) and adjust to control the ambient light.
3. Flash Settings:
* Enable HSS.
* Mode: TTL (to start)
* On-Camera Flash (with a diffuser) or Off-Camera Flash (with a softbox)
4. Process:
* Meter the ambient light with the aperture and ISO set. Adjust the shutter speed to get a properly exposed background *without* the flash. This will likely be overexposed.
* Turn on the flash and take a test shot. The background should now be more subdued, and your subject should be properly exposed by the flash.
* Adjust flash compensation to fine-tune the exposure of your subject.
* Adjust the shutter speed to further control the ambient light (background exposure). Faster shutter speeds will darken the background more.
In Conclusion
Using flash with High-Speed Sync unlocks a world of creative possibilities for portrait photography. By understanding the fundamentals, choosing the right gear, and practicing your technique, you can create stunning portraits with beautifully controlled light and shallow depth of field, even in challenging lighting conditions. Good luck!