Adjusting flash power with flash exposure compensation

Trick Photography And Special Effects

Trick Photography and Special Effects

Get Instant Access

When you shoot with your built-in flash, the camera attempts to adjust the flash output as needed to produce a good exposure in the current lighting conditions. On some occasions, you may find that you want a little more or less light than the camera thinks is appropriate.

You can adjust the flash output by using a feature called flash exposure compensation. This feature works similarly to exposure compensation, discussed earlier in this chapter. But flash exposure compensation affects the output level of the flash unit, whereas exposure compensation affects the brightness of the background in your flash photos. As with exposure compensation, the flash exposure compensation settings are stated in terms of EV (exposure value) numbers. A

setting of 0.0 indicates no flash adjustment; you can increase the flash power to +2.0 or decrease it to -2.0.

As an example of the benefit of this feature — again, available only when you shoot in the advanced exposure modes — take a look at Figure 5-26. I snapped these tomatoes during bright daylight, but they were shaded by a tent awning. The first image shows you a flash-free shot. Clearly, I needed a little more light, but at normal flash power, the flash was too strong, blowing out the highlights in some areas, as shown in the middle image. By dialing the flash power down to EV -1.3, I got a softer flash that straddled the line perfectly between no flash and too much flash.

No flash Flash EV 0.0 Flash EV -1.3

No flash Flash EV 0.0 Flash EV -1.3

Flash Exposure Compensation
Figure 5-26: When normal flash output is too strong, dial in a lower flash exposure compensation setting.

As for boosting the flash output, well, you may find it necessary on some occasions, but don't expect the built-in flash to work miracles even at a flash exposure compensation of +2.0. Any built-in flash has a limited range, and you simply can't expect the flash light to reach faraway objects. In other words, don't even try taking flash pictures of a darkened recital hall from your seat in the balcony — all you'll wind up doing is annoying everyone.

Whichever direction you want to go with flash power, display Shooting Menu 2 and highlight the Flash Exp Comp option, as shown on the left in Figure 5-27. Press Set to activate the little meter and then press the right or left cross key to specify the amount of flash compensation, as shown on the right in the figure. A higher value increases flash output; a lower value reduces it.

Flash exp comp "^iM'^2

Custom WB

Color space Adobe RGB

Picture Style Standard Dust Delete Data

Figure 5-27: Adjust flash power via Shooting Menu 2.

By the way, if you use flash exposure compensation a lot, you can customize the camera so that pressing the Set button displays that control, saving you the trouble of using the menus. Chapter 11 shows you how.

Flash Exposure Compensation

To let you know that flash compensation is in effect, the icon labeled in Figure 5-28 appears in the Shooting Settings display. You see the same plus/minus flash symbol in the viewfinder and Live View display, although in both cases without the actual flash exposure compensation value.

As with exposure compensation, any flash-power adjustment you make remains in force until you reset the control, even if you turn off the camera. So be sure to check the setting before you next use your flash. In addition, the Auto Lighting Optimizer feature, covered earlier in this chapter, can interfere with flash exposure compensation, so you may want to disable it.

Flash Exposure Compensation

Camera Symbol Exposure Flash
Figure 5-28: This symbol tells you that flash compensation is in effect.

Was this article helpful?

+1 0
Digital Cameras For Beginners

Digital Cameras For Beginners

Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.

Get My Free Ebook


  • Michael
    How to shut down the built in flash in Canon EOS 1000D camera?
    9 years ago
  • jaana vaara
    How to adjust flash compensation on EOS?
    9 years ago
  • Aatifa
    What is a flash exp comp for Canon EOS rebel xs?
    9 years ago
  • frediano
    How to adjust canon xs flash output?
    8 years ago
  • maximilian
    How to increase flashlight on a canon 450d?
    3 years ago
  • Merigo
    How to adjust the brightness of the flashlight at canon xsi rebel?
    2 years ago
  • bilcuzal
    What is adjust the flash power for on a canon camera?
    12 months ago
  • gundahar
    How to adjust flash on a rebel sl1?
    6 months ago

Post a comment