Setting Your White Balance for Flash Photography
The easiest way to set white balance for flash photography is to turn your white balance from Automatic to Manual and choose the in-camera profile for flash photography, generally represented as a lighting bolt symbol.
Using white balance in automatic mode can create more problems than it solves. Ambient light in your scene generally determines how the automatic mode adjusts your white balance. And once flash is introduced it can often make the colour of your subjects appear unnatural. Many problems caused by automatic white balance can be easily fixed in post production if you’re shooting in RAW, but the nature of automatic white balance is that your shots may vary in colour from photo to photo. Correcting this issue can end up being very time consuming.