Understanding the Basics
* Flash vs. Ambient Light: The core idea is to use flash as your main light source and then use the ambient (natural) light to fill in the shadows or create a specific mood. HSS allows you to use fast shutter speeds that would normally be unavailable with flash.
* High-Speed Sync (HSS): This is the key technology. Normally, your camera's flash sync speed is limited (e.g., 1/200th of a second). This is because the sensor needs to be fully exposed at one point in time for the flash to fire. HSS allows you to use faster shutter speeds (e.g., 1/1000th, 1/2000th, or faster) by firing the flash in a series of rapid pulses as the shutter curtain moves across the sensor.
* Why is HSS Important?
* Overpowering the Sun: Allows you to use wide apertures (e.g., f/2.8, f/1.8) in bright sunlight without overexposing the image. This creates shallow depth of field (blurred backgrounds) that are desirable in portraits.
* Controlling Ambient Light: You can darken the background or create dramatic skies, even during the day.
* Creative Control: More flexibility to balance the flash and ambient light.
Equipment Needed
* Camera: A DSLR or mirrorless camera with hot shoe and HSS compatibility.
* Flash: An external flash (speedlight or strobe) with HSS capability. Check your flash manual to confirm this. Godox, Profoto, and many other brands offer HSS-compatible flashes. Many modern flashes support TTL (Through-The-Lens) metering, which can simplify the process.
* Flash Trigger (Transmitter/Receiver Set): Required if your flash isn't directly on the camera's hot shoe. This wirelessly communicates with the flash and triggers it to fire. Some flashes have built in receivers, or some cameras have a built-in transmitter.
* Light Modifier (Optional but Highly Recommended):
* Softbox: Creates soft, flattering light. Great for portraits.
* Umbrella: Another way to soften the light, and often more portable than a softbox.
* Beauty Dish: Creates a more specular (slightly harder) light with a defined highlight.
* Reflector: To bounce light back into the shadows and fill them in.
* Light Stand (if using off-camera flash): To hold your flash and modifier.
Settings and Workflow
1. Camera Settings:
* Shooting Mode: Aperture Priority (Av or A) or Manual (M). Manual gives you the most control, but Aperture Priority can be a good starting point.
* Aperture: Set the desired aperture for your depth of field. Wide apertures (e.g., f/2.8, f/1.8, f/1.4) will create shallow depth of field and blurred backgrounds. Narrower apertures (e.g., f/5.6, f/8) will give you more in focus.
* ISO: Keep the ISO as low as possible (e.g., ISO 100, ISO 200) to minimize noise.
* Shutter Speed: This is where HSS comes in. Start with a shutter speed that is faster than your camera's sync speed (e.g., 1/500th, 1/1000th). Adjust it to control the ambient light. Faster shutter speeds will darken the background.
* White Balance: Set your white balance based on the ambient light or the desired look. "Daylight" or "Cloudy" are common starting points. You can also adjust in post-processing.
* Focus Mode: Single-point AF is often best for portraits. Focus on the subject's eye.
2. Flash Settings:
* Mode: TTL (Through-The-Lens) or Manual (M).
* TTL: The flash automatically adjusts its power based on the camera's metering. This can be very convenient, but you may need to use flash exposure compensation to fine-tune the results.
* Manual: You set the flash power manually (e.g., 1/1, 1/2, 1/4, 1/8 power). This gives you more control, but requires more experimentation.
* HSS (High-Speed Sync): Enable HSS mode on both your flash and your transmitter/receiver. The exact method depends on your equipment, so refer to the manuals.
* Flash Exposure Compensation (FEC): In TTL mode, use FEC to fine-tune the flash power without changing your aperture or shutter speed. Positive values increase the flash power, while negative values decrease it.
3. Flash Placement and Modification:
* Off-Camera Flash (Recommended): Place the flash off-camera, to the side or slightly in front of your subject. This creates more flattering light than on-camera flash.
* Light Modifier: Use a softbox, umbrella, or beauty dish to soften and diffuse the light. The size of the modifier affects the softness of the light (larger = softer).
* Distance: The closer the flash is to your subject, the softer the light will be.
4. Metering and Exposure:
* Ambient Light: Adjust your shutter speed to control the brightness of the background. A faster shutter speed will darken the background.
* Flash Power: Adjust the flash power (either manually or using FEC in TTL mode) to properly expose your subject. Look at your LCD screen and use the histogram to judge the exposure. The goal is to have detail in both the highlights and shadows.
5. Taking the Shot and Reviewing:
* Take a test shot and review the image on your camera's LCD.
* Pay attention to the exposure of the subject, the background, and the overall balance of light.
* Adjust your flash power, shutter speed, or aperture as needed.
* Repeat until you get the desired results.
Tips and Tricks
* Start Simple: Begin with a single light source and a simple modifier like a softbox.
* Feathering the Light: Don't aim the flash directly at your subject. "Feather" the light by aiming it slightly to the side. This creates a softer, more pleasing light.
* Inverse Square Law: Remember that light falls off quickly with distance. Moving the flash closer to your subject will drastically increase its intensity.
* Practice: The more you practice, the better you'll become at balancing flash and ambient light.
* Flash Power and HSS: Be aware that HSS reduces the effective power of your flash. You may need to increase the flash power significantly when using HSS, especially in bright sunlight. This is because the flash is pulsing rapidly, rather than delivering a single burst of power.
* Battery Life: HSS can drain your flash batteries quickly. Make sure you have fresh batteries or an external power pack.
* Modeling Light: Some strobes have a modeling light (a continuous light source) that allows you to see how the light will fall on your subject before you take the picture.
* Backlighting: HSS is excellent for backlighting. Overpower the sun to get properly exposed, blurred background images with lovely soft light on your subject.
Example Scenario:
Let's say you want to take a portrait of someone in a park on a sunny day with a blurred background.
1. Set your camera to Aperture Priority (Av) mode.
2. Choose a wide aperture (e.g., f/2.8) to blur the background.
3. Set your ISO to 100.
4. Enable HSS on your flash and trigger.
5. Place your flash off-camera, to the side of your subject, with a softbox attached.
6. Start with a shutter speed of 1/1000th of a second.
7. Take a test shot. The background may be dark, but your subject will likely be underexposed.
8. Adjust the flash power (using TTL exposure compensation or manual power settings) until your subject is properly exposed.
9. If the background is too dark, decrease the shutter speed (e.g., 1/500th, 1/250th) to let in more ambient light. Be careful not to overexpose the image.
10. Continue adjusting the flash power and shutter speed until you achieve the desired balance between the subject and the background.
Post-Processing
* Color Correction: Adjust the white balance and color tones to create the desired mood.
* Exposure Adjustments: Fine-tune the overall exposure and contrast.
* Retouching: Remove blemishes, soften skin, and enhance the eyes.
* Dodge and Burn: Subtly lighten and darken areas to sculpt the light and add dimension.
By understanding these concepts and practicing regularly, you can create stunning portraits using flash and high-speed sync, regardless of the ambient lighting conditions. Remember to experiment and have fun!