How to take proper picture by using external flash?what is the mistake I did in capturing picture I'm a noob in photography I have nikon d5300


I think you are using too high a shutter speed. Consult the manual for your external flash and use the shutter speed which is supported by your external flash.

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    The shutter sync speed limit is from the camera body, not from the flash. – inkista Dec 12 '18 at 9:45

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