Use high speed sync
Capture pin-sharp action or shallow focus using flash and fast shutter speeds
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For convincing environmental lighting, ensure the light coming from your flash has a credible source. Light doesn’t appear from nowhere, so consider colour, intensity and direction to match your flash to a suggested source
If you are shooting in a studio with your subject framed against a seamless background, you probably won’t need to use high-speed sync (HSS) flash mode. That’s because you can easily keep your shutter speed below the maximum flash sync speed, by stopping down your lens to f/11 or smaller.