1. Understanding High-Speed Sync:
* What is it? HSS allows you to fire your flash at shutter speeds *faster* than your camera's standard sync speed (usually 1/200th or 1/250th of a second). Without HSS, you'd get a black bar across your image at these faster speeds.
* Why use it?
* Overpowering Bright Sunlight: In bright sunlight, even at your widest aperture (like f/2.8), you might still need a fast shutter speed (e.g., 1/1000th or faster) to properly expose the ambient light. Without HSS, you'd be limited by your sync speed, potentially forcing you to stop down your aperture (increasing depth of field) or overexposing the background.
* Shallow Depth of Field: HSS lets you maintain that shallow depth of field by allowing you to use wide apertures while keeping the overall exposure balanced.
* Freezing Motion: Although HSS is primarily used for overpowering ambient light and shallow depth of field, the faster shutter speeds possible with HSS also help freeze motion.
* The Trade-Off: HSS comes at a cost:
* Reduced Flash Power: To achieve HSS, the flash emits a series of rapid pulses of light instead of a single burst. This reduces the effective power of the flash. You'll need to compensate by using a more powerful flash, moving the flash closer, or increasing the ISO.
* Faster Battery Drain: Those rapid pulses of light also drain your flash batteries faster.
* Recycle Time: Recycle times can also be longer with HSS.
2. Equipment Needed:
* Camera: A DSLR or mirrorless camera that supports HSS. Check your camera's manual to confirm.
* Flash: An external flash (speedlight or strobe) that also supports HSS. Most modern speedlights do, but some older or basic models might not. Strobe lights must specifically support high-speed sync or a similar function.
* Flash Trigger (Optional but Recommended): While some flashes can be triggered with built-in pop-up flash (often with HSS support in camera), dedicated radio triggers are more reliable and offer greater range and control. Make sure the trigger system is compatible with your camera and flash and supports HSS.
* Light Modifier (Recommended): Softboxes, umbrellas, reflectors, or beauty dishes help to soften the flash and create more flattering light.
3. Camera Settings:
* Shooting Mode: Aperture Priority (Av or A) is often a good starting point, but Manual (M) mode provides the most control.
* Aperture: Choose the aperture based on your desired depth of field. Start wide (e.g., f/2.8, f/4) to create that shallow depth of field.
* Shutter Speed: Set the shutter speed *above* your camera's sync speed. Experiment! Start at 1/500th, 1/1000th, or even faster. You'll adjust this to control the ambient light in your image.
* ISO: Keep the ISO as low as possible to minimize noise, but don't be afraid to bump it up if needed to compensate for the reduced flash power in HSS. Start at your camera's base ISO (usually 100).
* White Balance: Choose a white balance that suits the ambient light (e.g., Daylight, Shade, Cloudy). Alternatively, shoot in RAW and adjust white balance in post-processing.
* Metering Mode: Evaluative/Matrix metering is a good starting point. Experiment with spot metering if you need more precise control over exposure.
* Focus Mode: Single-point autofocus (AF-S or One-Shot) or continuous autofocus (AF-C or AI Servo) depending on whether your subject is moving. Use back-button focus for more control.
* Image Quality: Shoot RAW for maximum flexibility in post-processing.
4. Flash Settings:
* Enable HSS: Activate HSS on your flash (usually a button or menu setting). On a Godox flash, this is often accessed by pressing the sync speed button until you see the HSS icon (lightning bolt with an 'H'). On camera flash, it often has to be activated in the camera menu. Refer to your flash manual.
* Flash Mode: TTL (Through-The-Lens) metering can be helpful for quickly getting a starting point. Manual (M) flash mode provides the most consistent and predictable results once you understand how to use it.
* Flash Power: Adjust the flash power to balance the flash exposure with the ambient light. Start low and increase the power until your subject is properly lit.
5. Setting Up the Shot:
* Positioning: Place your subject in a location with flattering light and a visually appealing background.
* Flash Placement:
* Off-Camera Flash: Generally preferred. Use a stand or assistant to position the flash. Common positions include:
* Slightly to the side of the subject: Creates soft, directional light.
* At a 45-degree angle: Another popular choice for flattering light.
* Feathering the light: Aim the center of your light modifier slightly away from your subject. This utilizes the softer, edge of the light output.
* On-Camera Flash: Can work in a pinch, but the light is often harsh and unflattering. Use a diffuser or bounce the flash off a nearby surface.
* Light Modifiers: Use a light modifier to soften and shape the light.
* Softbox: Creates a soft, even light.
* Umbrella: More portable than a softbox and produces a similar effect.
* Beauty Dish: Creates a more contrasty light with a soft wrap.
* Reflector: Used to bounce light back onto the subject, filling in shadows.
* Distance: Adjust the distance between the flash and the subject to control the intensity of the light. Closer is brighter, farther is dimmer.
6. Shooting and Adjusting:
1. Take a Test Shot: Review the image on your camera's LCD screen.
2. Evaluate the Exposure:
* Overall Brightness: Adjust the shutter speed to control the overall brightness of the image. Faster shutter speeds darken the background and ambient light; slower shutter speeds brighten them.
* Subject Brightness: Adjust the flash power to control the brightness of your subject. Increase the flash power if the subject is too dark; decrease it if the subject is too bright.
* Depth of Field: Adjust aperture to adjust depth of field.
3. Adjust Settings: Make small adjustments to the shutter speed, flash power, and ISO until you achieve the desired exposure.
4. Fine-Tune: Pay attention to the highlights and shadows. Use your histogram to ensure you're not clipping either.
5. Repeat: Take more test shots and continue to refine your settings until you're happy with the results.
Tips for Success:
* Practice: Experiment with HSS in different lighting conditions to understand how it works.
* Understand Your Equipment: Read the manuals for your camera and flash to learn about their HSS capabilities.
* Use a Light Meter: An external light meter can help you get precise exposure readings.
* Shoot in RAW: Gives you maximum flexibility in post-processing.
* Post-Processing: Use post-processing software (like Adobe Lightroom or Capture One) to fine-tune the exposure, white balance, and colors.
* Communicate with Your Subject: Keep your subject informed and comfortable. A relaxed subject will lead to better portraits.
* Consider Location: Pay attention to the background. Avoid distracting elements and look for interesting textures and colors.
* Focus on Composition: Apply the rules of composition (e.g., rule of thirds, leading lines) to create visually appealing images.
* Battery Life: HSS can quickly drain your batteries. Bring extra batteries for both your camera and flash.
* Test Trigger Reliability: Ensure your triggers fire reliably at high shutter speeds. Radio triggers are generally more reliable than optical triggers in bright sunlight.
Example Scenario:
Let's say you're shooting a portrait in bright sunlight. You want to use an aperture of f/2.8 to blur the background, but the ambient light is so strong that even at your lowest ISO (100) and your camera's sync speed (1/200th), the image is overexposed.
1. Enable HSS on your flash and trigger.
2. Set your aperture to f/2.8.
3. Set your ISO to 100.
4. Set your shutter speed to 1/1000th of a second.
5. Take a test shot. The background will likely be properly exposed (or slightly underexposed), but your subject will be too dark.
6. Adjust the flash power. Increase the flash power (either on the flash itself or through your trigger) until your subject is properly lit. You might need to increase the flash power significantly due to the power loss in HSS.
7. Take another test shot.
8. Fine-tune: Adjust the shutter speed to control the brightness of the background and the flash power to control the brightness of your subject.
By following these steps, you can use HSS to create stunning outdoor portraits with beautiful bokeh, even in challenging lighting conditions. Remember to practice and experiment to find the settings that work best for you and your equipment.