Flash photography tips - has this ever happened to you? You take a portrait using your built-in or external flash, but the photo is too bright or too dark, like the slightly over-exposed couple and wedding register on the table in the above shot.
What did you do to fix it?:-
- Use exposure compensation
- Change from aperture to shutter priority or vice versa
- Change the flash exposure compensation (FEC)
- Change the ISO
Well, there is no one quick answer, it all depends on what part of the image was over or under-exposed and your creative intention when taking the photo. But it helps to know that when using flash, changing the shutter speed has absolutely no effect on the light from the flash. That's because the flash burst of light is almost instantaneous, much faster than any of your typical shutter speeds when using flash. Changing the shutter speed only affects the ambient light.
Here's a quick lighting setup outside my house during a sunny day. I put a speedlight on a stand and took a series of shots of the wall (extremely interesting subject!!). I used the camera's Manual mode and I only adjusted the shutter speed between shots.
You can see that the light on the wall from the flash is exactly the same in every shot, but the ambient light is getting lighter as I slow the shutter speed.