Controlling flash exposure
Three quick and easy ways to ensure perfect results by adjusting the exposures of your flash pictures
1 Flash Exposure Compensation
This allows you to adjust the output from the flash, making the subject lit by flash either brighter (positive compensation) or darker (negative compensation). Flash Exposure Compensation can be applied on the camera, or on a dedicated flashgun attached to the camera.
2 Flash Exposure Lock
Some cameras (like Canon’s 7D) have an FEL (Flash Exposure Lock) or FV (Flash Value Lock) button. Ensure the main subject is in the middle of the picture, then press the Flash Lock button. The flash will fire without an exposure being made, but the exposure setting will now be locked in. Simply reframe and take the picture.
3 Flash Exposure Bracketing
If timing isn’t crucial, try taking a series of exposures at a range of Flash Exposure Compensation settings to improve the chances of getting the perfect ratio of flash to ambient light. Advanced flashguns and cameras offer Automatic Flash Exposure Bracketing.