How to add a feathered gradient to flash images

Every DSLR camera has a maximum shutter speed at which there can be an effective synchronisation with a flash unit. The flash duration must exceed or match the duration of the total exposure, or the scene will not be evenly illuminated. 

However, if used in moderation and with the correct camera mode, the otherwise-undesirable frame darkening can be used creatively. By employing high-speed flash synchronisation and increasing the shutter speed above the maximum limit, a feathered brightness gradient is introduced. 

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