Setting exposure compensation of EOS REBEL T2i / EOS 550D
11-Mar-2010
8200743300
Solution
Exposure adjustments are a process in which the amount of light exposed to an image sensor is adjusted by the aperture value or the shutter speed to accommodate different levels of subject brightness. Correct exposure refers to optimal exposure for a subject, whereas underexposure is insufficient exposure and overexposure is excessive exposure.
If the mode dial of this camera is set to a mode other than <M>, the camera automatically sets the appropriate exposure value. If you want to adjust the exposure value that is set by the camera, you can use the exposure compensation setting.
Exposure compensation can increase (brighter) or decrease (darker) the standard exposure set by the camera. You can adjust the value if the mode dial is set to < P/Tv/Av/A-DEP >.
NOTE
The range of exposure compensation
- The compensable range is within ±5 stops in 1/3-stop increments.
- If you compensate for ±1 stop, the amount of light doubles or halves. For example, if the shutter speed is 1/250 sec., the camera uses the same amount of light for the following values for shooting.
At +1 stop, the shutter speed is 1/125 sec.
At -1 stop, the shutter speed is 1/500 sec.
- One stop is divided into three, which means 1/3 stop.
REFERENCE
- You can check the exposure compensation value in the viewfinder, or in the menu that appears on the LDC monitor.
- The exposure compensation indicator on the LCD panel and in the viewfinder can only display the setting up to ±2 stops. If you want to set the exposure compensation within the range of ±5, press the <MENU> button, and select [Exp. comp./AEB] from the menu to use the AEB function. For further information, please refer to Auto Exposure Bracketing (AEB) (EOS REBEL T2i/EOS 550D).
To compensate the exposure value, follow the instructions below.
1. Set the power switch to <ON>.
2. Set the Mode Dial to one of the < P/Tv/Av/A-DEP > modes.
3. While holding down the < 
> button, turn the <Main Dial> to set the mode.
> button, turn the <Main Dial> to set the mode.
Turn the dial to the left to make the flash exposure darker, and turn to the right to make it brighter.
5. Press the shutter button to take the picture.
To cancel exposure compensation, set the exposure compensation amount back to < 
>.
>.